{"id":1697,"date":"2026-08-05T18:37:50","date_gmt":"2026-08-05T18:37:50","guid":{"rendered":"https:\/\/lumexislaser.com\/?p=1697"},"modified":"2026-08-06T14:41:34","modified_gmt":"2026-08-06T14:41:34","slug":"what-is-laser-pumping","status":"publish","type":"post","link":"https:\/\/lumexislaser.com\/es\/what-is-laser-pumping\/","title":{"rendered":"\u00bfQu\u00e9 es el bombeo l\u00e1ser? C\u00f3mo las fuentes de bombeo determinan el rendimiento del l\u00e1ser"},"content":{"rendered":"<p class=\"wp-block-paragraph\">La mayor\u00eda de los problemas l\u00e1ser que aparecen tarde en un programa se remontan a la bomba, no al resonador. La salida se desv\u00eda a medida que la placa base se calienta. La eficiencia parece buena en el banco y desaparece a \u221230 \u00b0C. Un dise\u00f1o que cumpl\u00eda las especificaciones con un lote de diodos no las cumple con el siguiente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El resonador suele acaparar la atenci\u00f3n porque es donde la f\u00edsica resulta interesante. La bomba es donde viven el calor, la deriva y los modos de fallo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este art\u00edculo explica qu\u00e9 hace realmente el bombeo l\u00e1ser, en qu\u00e9 se diferencian las principales arquitecturas de bombeo y qu\u00e9 decisiones sobre la fuente de bombeo determinan si un l\u00e1ser mantiene sus especificaciones a lo largo de la temperatura, el tiempo y el volumen de producci\u00f3n.<\/p>\n\n\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Tabla de Contenidos<\/h2><nav><ul><li><a href=\"#the-physics-in-the-amount-of-detail-that-actually-matters\">La f\u00edsica, en la cantidad de detalle que realmente importa<\/a><\/li><li><a href=\"#a-pump-source-is-a-system-not-a-component\">Una fuente de bombeo es un sistema, no un componente<\/a><\/li><li><a href=\"#optical-electrical-chemical-and-why-one-of-them-won\">Bombeo \u00f3ptico, el\u00e9ctrico, qu\u00edmico \u2013 Cu\u00e1l es la diferencia<\/a><\/li><li><a href=\"#fiber-coupled-pumping\">\u00bfQu\u00e9 es el bombeo acoplado por fibra?<\/a><\/li><li><a href=\"#brightness-etendue-and-why-fibre-coupling-is-the-hard-part\">Brillo, \u00e9tendue, y por qu\u00e9 el acoplamiento de fibra es la parte dif\u00edcil<\/a><\/li><li><a href=\"#end-pumping-versus-side-pumping\">Bombeo por extremo versus bombeo lateral<\/a><\/li><li><a href=\"#quantum-defect-the-heat-you-cannot-design-away\">Defecto cu\u00e1ntico: el calor que no puedes eliminar con el dise\u00f1o<\/a><\/li><li><a href=\"#pump-wavelength-quick-reference\">Referencia r\u00e1pida de longitud de onda de bombeo<\/a><\/li><li><a href=\"#fluorescence-lifetime-energy-storage-and-pump-duty-cycle\">Vida \u00fatil de fluorescencia, almacenamiento de energ\u00eda y ciclo de trabajo de la bomba<\/a><\/li><li><a href=\"#what-actually-breaks-wavelength-drift-and-thermal-management\">Lo que realmente se rompe: deriva de longitud de onda y gesti\u00f3n t\u00e9rmica<\/a><\/li><li><a href=\"#the-efficiency-chain-where-100-electrical-watts-actually-go\">La cadena de eficiencia: a d\u00f3nde van realmente 100 vatios el\u00e9ctricos<\/a><\/li><li><a href=\"#how-to-read-a-pump-diode-datasheet-skeptically\">C\u00f3mo leer una hoja de datos de diodo de bomba con escepticismo<\/a><\/li><li><a href=\"#frequently-asked-questions\">Preguntas frecuentes<\/a><\/li><li><a href=\"#specifying-the-pump-before-you-specify-the-laser\">Especificar la bomba antes de especificar el l\u00e1ser<\/a><\/li><li><a href=\"#references\">Referencias<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n<div class=\"wp-block-cover\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"1000\" class=\"wp-block-cover__image-background wp-image-1814\" alt=\"Laboratorio l\u00e1ser con traje limpio Lumexis\" src=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_.png\" data-object-fit=\"cover\" srcset=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_.png 1000w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_-300x300.png 300w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_-150x150.png 150w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_-768x768.png 768w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_-600x600.png 600w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28801785952404_.pic_-100x100.png 100w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim\"><\/span><div class=\"wp-block-cover__inner-container is-layout-flow wp-block-cover-is-layout-flow\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\">LUMEXIS <\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\">Sala limpia para el ensamblaje de m\u00f3dulos l\u00e1ser<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>El bombeo l\u00e1ser es el proceso de inyectar energ\u00eda en un medio de ganancia para crear inversi\u00f3n de poblaci\u00f3n \u2014 m\u00e1s \u00e1tomos en un estado excitado que en el estado inferior \u2014 de modo que la emisi\u00f3n estimulada pueda producir ganancia \u00f3ptica. La energ\u00eda se entrega \u00f3pticamente (diodos, l\u00e1mparas de destello), el\u00e9ctricamente (corriente a trav\u00e9s de un semiconductor o gas) o qu\u00edmicamente. Sin bombeo, no hay l\u00e1ser.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1400\" height=\"876\" src=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1.webp\" alt=\"M\u00f3dulos de bombeo l\u00e1ser de diodo acoplados a fibra LUMEXIS con fibras de salida, utilizados para el bombeo l\u00e1ser de l\u00e1seres de estado s\u00f3lido y de fibra\" class=\"wp-image-1818\" srcset=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1.webp 1400w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1-300x188.webp 300w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1-1024x641.webp 1024w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1-768x481.webp 768w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-fiber-coupled-pump-diode-modules-1-600x375.webp 600w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><figcaption class=\"wp-block-image__caption\">M\u00f3dulos de bomba de diodos acoplados a fibra. La fuente de bombeo es un ensamblaje dise\u00f1ado \u2014 chip, \u00f3ptica de conformaci\u00f3n de haz, fibra y ruta t\u00e9rmica \u2014 no una entrada de energ\u00eda abstracta.<\/figcaption><\/figure>\n\n\n\n<h2 id=\"the-physics-in-the-amount-of-detail-that-actually-matters\" class=\"wp-block-heading\">La f\u00edsica, en la cantidad de detalle que realmente importa<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En equilibrio t\u00e9rmico, casi todos los \u00e1tomos de un material se encuentran en su estado fundamental. Si se hace pasar luz a trav\u00e9s de \u00e9l, la luz se absorbe. Eso es normal, y es lo contrario de lo que necesita un l\u00e1ser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El bombeo invierte eso. La energ\u00eda empuja los \u00e1tomos hacia un estado excitado m\u00e1s r\u00e1pido de lo que decaen, hasta que hay m\u00e1s excitados que no excitados. Una vez que existe esa inversi\u00f3n, un fot\u00f3n entrante de la energ\u00eda adecuada tiene m\u00e1s probabilidades de estimular a un \u00e1tomo excitado para que emita un fot\u00f3n id\u00e9ntico que de ser absorbido. La luz que entra en el medio sale amplificada. Eso es la ganancia \u00f3ptica, y todo lo dem\u00e1s en un l\u00e1ser \u2014 espejos, Q-switch, acoplador de salida \u2014 es maquinaria construida en torno a ella.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dos detalles estructurales gobiernan lo dif\u00edcil que es lograr la inversi\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>de cuatro niveles<\/strong> el medio de ganancia hace caer el \u00e1tomo a un nivel l\u00e1ser inferior que est\u00e1 esencialmente vac\u00edo a temperatura ambiente, y luego lo vuelca r\u00e1pidamente al estado fundamental. Como el nivel inferior permanece vac\u00edo, la inversi\u00f3n ocurre en cuanto se excita una peque\u00f1a fracci\u00f3n de los iones. <a href=\"https:\/\/lumexislaser.com\/es\/solid-state-lasers-guide\/\">Nd:YAG a 1064 nm<\/a> funciona as\u00ed, lo cual es gran parte de por qu\u00e9 es tan tolerante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>cuasi-tres-niveles<\/strong> el medio tiene un nivel l\u00e1ser inferior que est\u00e1 t\u00e9rmicamente poblado. Est\u00e1s luchando contra la reabsorci\u00f3n de tu propia salida, as\u00ed que una fracci\u00f3n sustancial de los iones debe excitarse antes de que veas alguna ganancia neta. Los sistemas de iterbio y erbio suelen comportarse as\u00ed. Exigen mayor intensidad de bombeo y una gesti\u00f3n t\u00e9rmica mucho m\u00e1s estricta, y castigan una fuente de bombeo subespecificada mucho m\u00e1s de lo que lo hace un dise\u00f1o de cuatro niveles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vale la pena llevar esta distinci\u00f3n a una revisi\u00f3n de dise\u00f1o, porque determina cu\u00e1nto margen de bombeo necesitas antes de que el l\u00e1ser arranque siquiera en el extremo fr\u00edo de tu rango de operaci\u00f3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Entre esos dos se sit\u00faa el cl\u00e1sico sistema de tres niveles, que vale la pena conocer porque es donde comenz\u00f3 el campo. En el rub\u00ed, una l\u00e1mpara de destello eleva los iones de cromo a una banda de absorci\u00f3n amplia, desde la cual caen de forma no radiativa a un nivel metaestable en aproximadamente 10<sup>\u22128<\/sup>&nbsp;s. Ese nivel luego los retiene durante unos 10<sup>\u22123<\/sup>&nbsp;s \u2014 cinco \u00f3rdenes de magnitud m\u00e1s \u2014 as\u00ed que la poblaci\u00f3n se acumula all\u00ed hasta que supera el estado fundamental y la salida a 694,3 nm se vuelve posible. La relaci\u00f3n entre esas dos escalas de tiempo es todo el truco, y reaparece m\u00e1s adelante en este art\u00edculo como lo que decide cu\u00e1nta energ\u00eda puede almacenar un l\u00e1ser Q-switched.<\/p>\n\n\n\n<h2 id=\"a-pump-source-is-a-system-not-a-component\" class=\"wp-block-heading\">Una fuente de bombeo es un sistema, no un componente<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Los ingenieros especifican una bomba como una longitud de onda y una potencia. Los proveedores env\u00edan un ensamblaje. Entre esas dos afirmaciones se sit\u00faan cuatro subsistemas, y cualquiera de ellos puede ser lo que silenciosamente te cueste un diez por ciento de tu salida.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La electr\u00f3nica de accionamiento.<\/strong> La longitud de onda, la potencia de salida y la vida \u00fatil de un diodo siguen su corriente de uni\u00f3n y su temperatura. Un driver con mala regulaci\u00f3n de corriente, rizado visible o un encendido no controlado desplaza la longitud de onda de emisi\u00f3n durante el pulso y acorta la vida del diodo a trav\u00e9s de transitorios. En operaci\u00f3n cuasi-continua, el tiempo de subida de la corriente da forma directamente al pulso de bombeo y por lo tanto a la energ\u00eda almacenada. El driver no es un accesorio de la fuente de bombeo. Es parte de ella.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>El emisor.<\/strong> Emisor \u00fanico, barra o pila \u2014 y, dentro de un m\u00f3dulo acoplado a fibra, la \u00f3ptica de conformaci\u00f3n de haz que convierte una salida de diodo salvajemente asim\u00e9trica en algo que una fibra realmente aceptar\u00e1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La ruta de acoplamiento.<\/strong> Colimaci\u00f3n de eje r\u00e1pido, colimaci\u00f3n de eje lento, enfoque, a veces multiplexaci\u00f3n de polarizaci\u00f3n y longitud de onda, y la propia fibra. Cada superficie aqu\u00ed conlleva una p\u00e9rdida de transmisi\u00f3n y un coeficiente t\u00e9rmico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La ruta t\u00e9rmica.<\/strong> Submount, solder, baseplate, interface material, cold plate. Junction temperature is what the physics responds to; case temperature is what the datasheet quotes. The difference between them is a property of this stack, not of the diode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Una disciplina \u00fatil en una revisi\u00f3n de dise\u00f1o es preguntar cu\u00e1l de estos cuatro est\u00e1s comprando y cu\u00e1l se te deja para que lo construyas. Un diodo desnudo es barato porque tres de los cuatro se convierten en tu problema. Un <a href=\"https:\/\/lumexislaser.com\/es\/fiber-coupled-lasers\/\">m\u00f3dulo acoplado a fibra<\/a> caracterizado cuesta m\u00e1s porque el proveedor ya ha cerrado el ciclo en los cuatro y puede declarar la potencia entregada en el extremo de la fibra a lo largo de tu ventana de temperatura.<\/p>\n\n\n\n<h2 id=\"optical-electrical-chemical-and-why-one-of-them-won\" class=\"wp-block-heading\">Bombeo \u00f3ptico, el\u00e9ctrico, qu\u00edmico \u2013 Cu\u00e1l es la diferencia<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hay tres formas de entregar energ\u00eda de bombeo, y en la pr\u00e1ctica la mayor\u00eda de los ingenieros solo se encuentran con dos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bombeo \u00f3ptico<\/strong> utiliza luz adaptada a las bandas de absorci\u00f3n del medio de ganancia. Las l\u00e1mparas de destello hicieron esto durante d\u00e9cadas y todav\u00eda aparecen en sistemas pulsados de alta energ\u00eda, pero son de banda ancha, ineficientes y calientes: la mayor parte de la salida de la l\u00e1mpara cae fuera de la banda de absorci\u00f3n y se convierte en calor residual en el cristal. Los diodos l\u00e1ser los reemplazaron en casi todas partes porque la emisi\u00f3n de diodo puede colocarse directamente sobre un pico de absorci\u00f3n. Ese \u00fanico cambio \u2014 la adaptaci\u00f3n espectral \u2014 es responsable de la mayor parte de la ganancia de eficiencia en los l\u00e1seres de estado s\u00f3lido durante los \u00faltimos treinta a\u00f1os.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bombeo el\u00e9ctrico<\/strong> impulsa corriente directamente a trav\u00e9s del medio de ganancia. Los l\u00e1seres de gas utilizan una descarga. Los l\u00e1seres de diodo semiconductor utilizan corriente a trav\u00e9s de una uni\u00f3n p-n, donde la recombinaci\u00f3n produce fotones directamente. Los l\u00e1seres de diodo son dispositivos bombeados el\u00e9ctricamente que a su vez se utilizan como bombas \u00f3pticas para otros l\u00e1seres, lo cual es algo genuinamente \u00fatil de tener claro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bombeo qu\u00edmico<\/strong> extrae la inversi\u00f3n de una reacci\u00f3n, t\u00edpicamente la combusti\u00f3n de hidr\u00f3geno y fl\u00faor. Escala a potencias muy altas sin suministro el\u00e9ctrico, que es la raz\u00f3n por la que existe, pero es raro y est\u00e1 confinado a sistemas especializados.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image-1024x683.png\" alt=\"CHEMICAL PUMPING PRINCIPLE\" class=\"wp-image-1815\" srcset=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image-1024x683.png 1024w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image-300x200.png 300w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image-768x512.png 768w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image-600x400.png 600w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/image.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Para cualquier cosa que probablemente dise\u00f1es en un producto, la cuesti\u00f3n no es cu\u00e1l de los tres usar. Es qu\u00e9 diodo de bombeo, a qu\u00e9 longitud de onda, en qu\u00e9 geometr\u00eda.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pon los m\u00e9todos uno al lado del otro y el compromiso deja de ser sutil.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>M\u00e9todo de bombeo<\/th><th>Eficiencia el\u00e9ctrica\u2192\u00f3ptica<\/th><th>Vida \u00fatil t\u00edpica<\/th><th>Coincidencia espectral<\/th><th>D\u00f3nde sigue teniendo sentido<\/th><\/tr><\/thead><tbody><tr><td>L\u00e1mpara de destello<\/td><td>~1\u20135% dentro de la banda de absorci\u00f3n<\/td><td>10<sup>7<\/sup>\u201310<sup>8<\/sup> shots<\/td><td>Broadband; most of it wasted as heat<\/td><td>Very high pulse energy, cost-driven or service-accessible systems<\/td><\/tr><tr><td>Diode, direct (end or side)<\/td><td>45\u201365%<\/td><td>&gt;20,000 h typical<\/td><td>Narrow, placed on the absorption peak<\/td><td>Most DPSS products: marking, ranging, micromachining<\/td><\/tr><tr><td>Diode, fibre-coupled<\/td><td>40\u201355% after coupling<\/td><td>&gt;20,000 h typical<\/td><td>Narrow, plus flexible delivery<\/td><td>Fibre lasers and amplifiers; pump located away from the gain medium<\/td><\/tr><tr><td>Gas discharge (DC or RF)<\/td><td>5\u201320%<\/td><td>Tube-life limited<\/td><td>Not applicable \u2014 direct excitation<\/td><td>CO<sub>2<\/sub>, excimer, HeNe<\/td><\/tr><tr><td>Chemical<\/td><td>No electrical input<\/td><td>Consumable-limited<\/td><td>Not applicable<\/td><td>Very high power where no power supply exists<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Two footnotes on the methods most engineers never touch. Gas-discharge pumping splits into continuous glow discharge (HeNe, sealed CO<sub>2<\/sub>), radio-frequency excitation, which produces a more uniform plasma at higher gas pressure, and pulsed discharge with ultraviolet pre-ionisation \u2014 the technique that lets excimer and TEA CO<sub>2<\/sub> lasers fire as a uniform volume discharge instead of collapsing into an arc. Chemical pumping likewise splits in two: combustion-driven HF and DF systems, and photodissociation lasers, where ultraviolet light cracks an alkyl iodide such as CF<sub>3<\/sub>I to leave excited iodine atoms emitting at 1.315\u00a0\u00b5m. Both exist because they scale to power levels a wall socket cannot supply.<\/p>\n\n\n\n<h2 id=\"fiber-coupled-pumping\" class=\"wp-block-heading\">\u00bfQu\u00e9 es el bombeo acoplado por fibra?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fiber-coupled pumping involves coupling the outputs of multiple laser diodes into a single optical fiber via a <a href=\"https:\/\/lumexislaser.com\/es\/what-is-a-fiber-coupled-laser\/\">fiber combiner<\/a> to achieve high-brightness pumping. This approach is suitable for high-power fiber lasers and amplifiers, enabling laser output at the kilowatt level or higher.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The advantages of fiber-coupled pumping include high flexibility and simplified thermal management; the pump source can be separated from the gain fiber, thereby reducing the laser\u2019s footprint while enhancing system stability and reliability. Furthermore, techniques such as wavelength locking and spectral beam combining can be employed to further increase pump brightness and achieve even higher output power.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd-1024x683.webp\" alt=\"fiber coulped laser diode for laser pumping solutions\" class=\"wp-image-1816\" srcset=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd-1024x683.webp 1024w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd-300x200.webp 300w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd-768x512.webp 768w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd-600x400.webp 600w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/28911785954904_.pic_hd.webp 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/lumexislaser.com\/es\/fiber-coupled-lasers\/\">View Our Fiber Coupled laser collections<\/a><\/div>\n<\/div>\n\n\n\n<h2 id=\"brightness-etendue-and-why-fibre-coupling-is-the-hard-part\" class=\"wp-block-heading\">Brillo, \u00e9tendue, y por qu\u00e9 el acoplamiento de fibra es la parte dif\u00edcil<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A diode emitter is a poor optical object. Its output is violently divergent in the fast axis and nearly diffraction-limited there, then much less divergent but spatially broad in the slow axis. You cannot fix that by focusing harder. The product of spot size and divergence angle \u2014 \u00e9tendue, or its inverse, brightness \u2014 is conserved through any passive optical system. You can trade beam size against angle. You cannot reduce the product.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Every element inside a fibre-coupled module exists to work within that constraint. Fast-axis collimation with a short-focal-length cylindrical microlens tames the divergent axis first, because uncollimated fast-axis light is exactly what overfills a fibre\u2019s numerical aperture. Slow-axis collimation and beam shaping \u2014 step mirrors, rotating prism arrays \u2014 then redistribute the beam so both axes present comparable \u00e9tendue. Only after that does focusing into a 105, 135 or 200\u00a0\u00b5m core at 0.22\u00a0NA become possible without discarding half the power at the fibre face.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once one emitter is in a fibre, brightness scaling continues by combining beams in dimensions that cost no \u00e9tendue: polarisation combining, which merges two orthogonal states through one aperture; spectral combining, which merges several wavelengths through a dichroic or a grating; and, in fibre, an (N+1)\u00d71 tapered fibre bundle that merges several multimode pump fibres around a signal core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Volume Bragg grating wavelength locking belongs on this list too. Narrowing a diode from a 3\u20134\u00a0nm free-running spectrum to well under 1\u00a0nm and pinning it against temperature is not only a drift fix \u2014 it is what makes spectral combining possible at all, and it is what lets you use a narrow absorption feature such as the <a href=\"https:\/\/lumexislaser.com\/es\/976nm-fiber-coupled-laser\/\">976\u00a0nm ytterbium peak<\/a> that a free-running diode would simply walk off.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is where a supplier\u2019s process either shows up or does not. Automated active alignment during fibre coupling, and verification of delivered power at the connector rather than at the chip, is the whole difference between a datasheet number and a system number. Our <a href=\"https:\/\/lumexislaser.com\/es\/technology\/\">manufacturing and test flow<\/a> is built around that distinction.<\/p>\n\n\n\n<h2 id=\"end-pumping-versus-side-pumping\" class=\"wp-block-heading\">Bombeo por extremo versus bombeo lateral<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Where you inject the pump light changes what the laser is good at.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>End pumping<\/strong> sends the pump in along the resonator axis, usually through a dichroic mirror. Because the pump volume can be shaped to overlap the resonator mode closely, conversion efficiency is high and the output beam quality is excellent. The cost is that the pump beam itself must be good \u2014 you are focusing it into a small volume, so brightness matters, and thermal load concentrates in a short length of crystal. Thermal lensing shows up early.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Side pumping<\/strong> fires diode bars radially into the rod. Pump beam quality barely matters, so you can use cheap, high-power bars and scale to multiwatt and higher output. The trade is a less uniform overlap with the resonator mode, which costs efficiency and beam quality.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cladding pumping<\/strong> is the fiber-laser equivalent and deserves separate mention. Pump light is launched into a large multimode inner cladding rather than the small doped core. It propagates along the fiber, crossing the core repeatedly and being absorbed gradually over meters. This is what makes high-power fiber lasers practical: it decouples pump brightness from the requirement to hit a tiny core, letting relatively modest fiber-coupled diodes drive a single-mode output. It is the architecture behind most 976 nm-pumped ytterbium and erbium-ytterbium systems, including the 1.5 \u00b5m sources used in eye-safe LiDAR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Good side-pumped heads work considerably harder than that description suggests. A common arrangement surrounds the rod with three diode modules at 120\u00b0 and encloses it in a glass tube whose outer surface is coated high-reflecting at the pump wavelength everywhere except three narrow anti-reflection stripes where the modules inject. The result is a closed pump cavity: light that misses the crystal on its first pass is reflected back and forth until it is absorbed, and because it then arrives from three directions after multiple bounces, the gain distribution across the rod cross-section comes out far more uniform than three discrete beams would imply. Uniform gain is what keeps the thermal lens symmetric, which is what keeps the output beam round.<\/p>\n\n\n\n<h2 id=\"quantum-defect-the-heat-you-cannot-design-away\" class=\"wp-block-heading\">Defecto cu\u00e1ntico: el calor que no puedes eliminar con el dise\u00f1o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pump a laser at 808 nm and extract at 1064 nm, and the energy difference between those photons does not vanish. It becomes heat in the crystal. That fraction is the <strong>quantum defect<\/strong>, and it sets a hard floor on thermal load no matter how good your optics are.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At 808 nm into 1064 nm, roughly a quarter of every pumped photon\u2019s energy is lost this way. It is the dominant heat source in a well-built DPSS laser, and heat is what drives thermal lensing, stress birefringence, and eventually crystal fracture.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why longer pump wavelengths became interesting. Pumping Nd:YAG at 885 or 888 nm instead of 808 nm cuts the quantum defect by more than half, with a corresponding drop in heat generation. There is a catch, and it is instructive: neodymium\u2019s absorption is much weaker at 880 nm than at 808 nm. Weaker absorption means the pump penetrates further, so you need a longer crystal \u2014 30 mm rather than the 8 mm or less typical of 808 nm designs. In exchange you spread the heat over a longer volume, which is exactly what you wanted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At 888 nm there is a further benefit worth knowing about. Absorption becomes nearly polarization-insensitive, which removes the need for tight wavelength locking and aggressive temperature control on the pump diodes. For a field-deployed system, dropping a TEC and its control loop is a meaningful reduction in power draw, volume, and failure modes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That is the shape of most real pumping decisions. There is rarely a free improvement \u2014 there is a trade you either make deliberately or discover during qualification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This family of approaches has a name worth using, because it is what the literature and most datasheets call it: <strong>in-band<\/strong> o <strong>resonant pumping<\/strong> \u2014 depositing pump energy directly into the upper laser level rather than into a higher band that then relaxes into it. Pumping ytterbium at 976\u00a0nm to emit at 1030\u00a0nm leaves a quantum defect near 5%, roughly a fifth of what 808\u00a0nm into 1064\u00a0nm costs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thulium at 793\u00a0nm is the case that breaks the arithmetic in a useful direction. The raw photon-energy difference to 2\u00a0\u00b5m output looks catastrophic, close to 60%. But thulium exhibits cross-relaxation: one absorbed pump photon can end up exciting two ions, approaching 200% quantum efficiency, which brings the effective thermal load down to roughly 18%. Quantum defect computed from wavelengths alone is a first-order estimate. Before you accept it, check whether your gain medium has an energy-transfer mechanism that changes the answer \u2014 <a href=\"https:\/\/lumexislaser.com\/es\/793nm-fiber-coupled-laser\/\">793\u00a0nm pump sources<\/a> exist precisely because it does here.<\/p>\n\n\n\n<h2 id=\"pump-wavelength-quick-reference\" class=\"wp-block-heading\">Referencia r\u00e1pida de longitud de onda de bombeo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Most of the pumping decision collapses into one table: which wavelengths carry commercial solid-state and fibre lasers, what each is for, and roughly what each costs you in heat.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Longitud de onda de bomba<\/th><th>Medio de ganancia<\/th><th>Typical output<\/th><th>Approx. quantum defect<\/th><th>Por qu\u00e9 lo elegir\u00eda<\/th><\/tr><\/thead><tbody><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/790nm-fiber-coupled-laser\/\">790<\/a> \/ <a href=\"https:\/\/lumexislaser.com\/es\/792nm-fiber-coupled-laser\/\">792<\/a> \/ <a href=\"https:\/\/lumexislaser.com\/es\/793nm-fiber-coupled-laser\/\">793<\/a>&nbsp;Longitud de onda central<\/td><td>Tm, Tm:Ho<\/td><td>1.9\u20132.1\u00a0\u00b5m<\/td><td>~59% raw, ~18% effective<\/td><td>Cross-relaxation nearly doubles quantum efficiency; 2\u00a0\u00b5m medical and sensing sources<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/808nm-fiber-coupled-laser\/\">808\u00a0nm<\/a><\/td><td>Nd:YAG, Nd:YVO<sub>4<\/sub><\/td><td>1064\u00a0nm<\/td><td>24.1%<\/td><td>Strongest Nd absorption, shortest crystal, deepest and cheapest supply chain<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/878-6nm-fiber-coupled-laser\/\">878.6\u00a0nm<\/a><\/td><td>Nd:YVO<sub>4<\/sub><\/td><td>1064\u00a0nm<\/td><td>17.4%<\/td><td>In-band pumping; requires a wavelength-locked diode<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/885nm-fiber-coupled-laser\/\">885\u00a0nm<\/a><\/td><td>Nd:YAG<\/td><td>1064\u00a0nm<\/td><td>16.8%<\/td><td>In-band; markedly less heat, at the cost of a longer crystal<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/888nm-fiber-coupled-laser\/\">888\u00a0nm<\/a><\/td><td>Nd:YVO<sub>4<\/sub><\/td><td>1064\u00a0nm<\/td><td>16.5%<\/td><td>Absorption is nearly polarisation-independent \u2014 the most tolerant in-band option, and TEC-friendly<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/915nm-fiber-coupled-laser\/\">915\u00a0nm<\/a><\/td><td>Yb-doped fibre<\/td><td>1070\u00a0nm<\/td><td>14.5%<\/td><td>Broad, flat absorption; drift-tolerant and needs no wavelength locking<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/976nm-fiber-coupled-laser\/\">976\u00a0nm<\/a><\/td><td>Yb and Er:Yb fibre<\/td><td>1030\u20131070\u00a0nm; 1535\u20131550\u00a0nm<\/td><td>5.2% (1030), 8.8% (1070), 36.4% (1535)<\/td><td>Strongest absorption per unit length, shortest fibre \u2014 but the peak is narrow and needs stabilisation<\/td><\/tr><tr><td><a href=\"https:\/\/lumexislaser.com\/es\/525nm-fiber-coupled-laser\/\">525\u00a0nm<\/a><\/td><td>Ti:sapphire, alexandrite, dyes and fluorophores<\/td><td>Tunable \/ visible<\/td><td>Application-dependent<\/td><td>Direct green pumping and <a href=\"https:\/\/lumexislaser.com\/es\/solutions\/spectroscopy-fluorescence\/\">fluorescence excitation<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The pattern is consistent, and it is the single most useful thing to carry out of this table: the wavelengths that generate the least heat are the ones with the weakest, narrowest absorption, so they demand a longer crystal or tighter wavelength control in exchange. We build <a href=\"https:\/\/lumexislaser.com\/es\/solutions\/laser-pumping\/\">fibre-coupled pump sources<\/a> across all of these bands, and the trade between thermal load and pump-source discipline is worth settling at the concept stage rather than during qualification.<\/p>\n\n\n\n<h2 id=\"fluorescence-lifetime-energy-storage-and-pump-duty-cycle\" class=\"wp-block-heading\">Vida \u00fatil de fluorescencia, almacenamiento de energ\u00eda y ciclo de trabajo de la bomba<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An excited ion does not wait indefinitely. The upper-level fluorescence lifetime is the average time it stays excited before decaying spontaneously, and it settles two commercially important questions: how much energy a Q-switched laser can store, and how long your pump pulse should be.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Medio de ganancia<\/th><th>Upper-level lifetime<\/th><th>What that means in practice<\/th><\/tr><\/thead><tbody><tr><td>Nd:YVO<sub>4<\/sub><\/td><td>90\u2013100\u00a0\u00b5s<\/td><td>High gain, poor storage \u2014 suits CW and high-repetition-rate operation<\/td><\/tr><tr><td>Nd:YAG<\/td><td>~230\u00a0\u00b5s<\/td><td>The general-purpose compromise; standard for Q-switched marking and ranging<\/td><\/tr><tr><td>Nd:YLF<\/td><td>~480\u00a0\u00b5s<\/td><td>Long storage, high pulse energy at lower repetition rate<\/td><\/tr><tr><td>Yb-doped fibre<\/td><td>~800\u00a0\u00b5s \u2013 1\u00a0ms<\/td><td>Very high storage; also why Yb amplifiers tolerate gentle pumping<\/td><\/tr><tr><td>Er:vidrio<\/td><td>Milliseconds<\/td><td>Exceptional storage \u2014 the basis of compact eye-safe 1535\u00a0nm transmitters<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Nd:YVO<sub>4<\/sub> and Nd:YAG make the trade concrete. Vanadate\u2019s emission cross-section is roughly five times that of YAG, which is why it lases at lower threshold and higher gain. But cross-section and lifetime pull in opposite directions: the same property that gives vanadate its gain drains the upper level in under 100\u00a0\u00b5s. YAG holds population longer and therefore yields more energy per Q-switched pulse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The rule that follows is blunt:<\/strong> pumping for much longer than the upper-level lifetime does not store more energy. It just heats the crystal. Which is why pump duty cycle is a specification and not a detail:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>CW pumping<\/strong> \u2014 constant current, steady thermal load, stable thermal lens. Correct for continuous output and for repetition rates high enough that the thermal state never really changes.<\/li><li><strong>QCW pumping<\/strong> \u2014 the pump runs for a few hundred microseconds around each output pulse, then switches off. Because the diode dissipates during only a small fraction of the cycle, it can be driven to peak currents several times its CW rating, delivering far higher peak pump power from the same package while average thermal load stays low. The pump pulse should be on the order of the upper-level lifetime; longer buys nothing.<\/li><li><strong>Pulsed and burst modes<\/strong> \u2014 everything else, usually dictated by an application duty cycle rather than by the gain medium.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For a battery-powered rangefinder firing a few pulses per second, QCW is not an optimisation \u2014 it is the reason the product can exist at all. <a href=\"https:\/\/lumexislaser.com\/es\/erbium-glass-lasers\/\">Er:vidrio<\/a> holds its inversion for milliseconds, so a modest diode can pump it slowly and a Q-switch can dump the result as a single high-peak-power 1535\u00a0nm pulse: eye-safe, and bright enough for kilometre-class <a href=\"https:\/\/lumexislaser.com\/es\/solutions\/laser-ranging\/\">telemetr\u00eda<\/a> from a handheld or UAV-mounted head. The same logic scales up in erbium-doped fibre for <a href=\"https:\/\/lumexislaser.com\/es\/lidar-pulsed-fiber-lasers\/\">1.5\u00a0\u00b5m LiDAR sources<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A datasheet that quotes only CW power tells you nothing about QCW capability. Ask for peak current rating, maximum pulse width and duty-cycle limit together \u2014 those three numbers, not the CW figure, decide what pulse energy you can build.<\/p>\n\n\n\n<h2 id=\"what-actually-breaks-wavelength-drift-and-thermal-management\" class=\"wp-block-heading\">Lo que realmente se rompe: deriva de longitud de onda y gesti\u00f3n t\u00e9rmica<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A pump diode\u2019s emission wavelength moves with junction temperature, typically around 0.3 nm per \u00b0C. The gain medium\u2019s absorption peak does not move with it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run the math on that and the problem is obvious. A diode specified at 808 nm at 25 \u00b0C is emitting closer to 811 nm at 35 \u00b0C. If your crystal\u2019s absorption band is a few nanometers wide, you have walked partly off the peak, absorbed less pump, and lost output \u2014 and the shortfall gets blamed on the crystal or the resonator, because those are easier to inspect.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three approaches exist, and they suit different products.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Active temperature control<\/strong> with a TEC holds the diode at a fixed junction temperature. It works, and it costs power, volume, and a control loop that can itself fail. On a battery-powered or size-constrained platform this is often the wrong answer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Wavelength-stabilized diodes<\/strong> using a volume Bragg grating lock emission largely independent of temperature. This costs more per diode and typically some efficiency, but it removes the TEC.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>TEC-less design<\/strong> accepts the drift and engineers around it \u2014 choosing a broader absorption feature, biasing the nominal wavelength so the drift lands on-peak at the most demanding operating point, or accepting a specified output derating across temperature. Done deliberately, this produces the simplest and most robust system. Done accidentally, it produces a laser that works in the lab and disappoints in the field.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Our team designs for TEC-less operation wherever the application allows it, because for UAV, vehicle-mounted, and handheld platforms the removed complexity is usually worth more than the last few percent of efficiency. That analysis is application-specific, though, and it belongs in the first design review rather than the qualification phase.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1400\" height=\"820\" src=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3.webp\" alt=\"Chart showing pump diode wavelength drift of about 0.3 nm per degree C against a fixed Nd:YAG 808 nm absorption band\" class=\"wp-image-1819\" srcset=\"https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3.webp 1400w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3-300x176.webp 300w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3-1024x600.webp 1024w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3-768x450.webp 768w, https:\/\/lumexislaser.com\/wp-content\/uploads\/2026\/08\/lumexis-pump-diode-wavelength-drift-3-600x351.webp 600w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><figcaption class=\"wp-block-image__caption\">Diode emission moves roughly 0.3\u00a0nm\/\u00b0C. The crystal\u2019s absorption peak does not move with it.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Temperature control is only the last link in the chain. The junction temperature that sets your wavelength is the sum of everything between the active region and your cold plate: submount, solder, baseplate, thermal interface material. Aluminium nitride and copper-tungsten submounts are used because they conduct well and, more importantly, because their thermal expansion is close to the semiconductor\u2019s \u2014 a mismatch here does not cause a thermal problem, it causes a mechanical one, as every power cycle works the solder joint a little further. Diamond appears where power density leaves no alternative.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Above that stack the choice is conduction cooling to a chassis, which is simple and sealed, or microchannel water cooling, which handles far higher flux but adds plumbing, corrosion and a failure mode that takes the diode with it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Get this wrong and the failure is not gradual. Catastrophic optical mirror damage is the emitting facet melting under its own optical field, and it is a single-event, unrecoverable failure. Slow facet oxidation in a non-hermetic package is the same story told over years. Both are why derating matters: a diode run at 70% of rated current typically lives several times longer than one run at 100%, and that is usually a cheaper way to buy lifetime than a larger cooler.<\/p>\n\n\n\n<h2 id=\"the-efficiency-chain-where-100-electrical-watts-actually-go\" class=\"wp-block-heading\">La cadena de eficiencia: a d\u00f3nde van realmente 100 vatios el\u00e9ctricos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quantum defect is the loss engineers quote, but it is one term in a chain, and the chain is multiplicative. Work an 808\u00a0nm-pumped Nd:YAG example end to end with ordinary \u2014 not optimistic \u2014 numbers:<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th>Stage<\/th><th>Typical factor<\/th><th>Running total from 100\u00a0W electrical<\/th><\/tr><\/thead><tbody><tr><td>Diode electrical-to-optical conversion<\/td><td>55%<\/td><td>55\u00a0W optical<\/td><\/tr><tr><td>Coupling into the delivery fibre<\/td><td>90%<\/td><td>49.5\u00a0W at the fibre end<\/td><\/tr><tr><td>Delivery and mode matching into the crystal<\/td><td>92%<\/td><td>45.5\u00a0W incident<\/td><\/tr><tr><td>Absorption in the crystal<\/td><td>92%<\/td><td>41.9\u00a0W absorbed<\/td><\/tr><tr><td>Quantum defect, 808\u00a0\u2192\u00a01064\u00a0nm<\/td><td>75.9% retained<\/td><td>31.8\u00a0W as 1064\u00a0nm photons<\/td><\/tr><tr><td>Upper-state losses, resonator losses, output coupling<\/td><td>~60%<\/td><td><strong>\u224819\u00a0W out<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Roughly 19% wall-plug, and about 81\u00a0W of heat spread across the diode package, the coupling optics and the crystal. Two things fall out of that table. First, the largest single loss is the diode itself, not the quantum defect \u2014 which is why diode efficiency and <a href=\"https:\/\/lumexislaser.com\/es\/fiber-coupled-lasers\/\">coupling efficiency<\/a> deserve the scrutiny normally reserved for the resonator. Second, moving to <a href=\"https:\/\/lumexislaser.com\/es\/888nm-fiber-coupled-laser\/\">888\u00a0nm<\/a> improves exactly one line of this table, from 75.9% to 83.5% retained \u2014 worth around 2\u00a0W of extra output, but a great deal more in reduced crystal heating and thermal lensing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run the table with your own numbers before you commit to an architecture. It is the fastest way to find out whether your thermal budget is realistic, and it usually reorders the priority list.<\/p>\n\n\n\n<h2 id=\"how-to-read-a-pump-diode-datasheet-skeptically\" class=\"wp-block-heading\">C\u00f3mo leer una hoja de datos de diodo de bomba con escepticismo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pump modules are commodity-priced and are not commodities. The differences that matter are mostly not on the front page of the datasheet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is the wavelength a specification or a typical value, and at what case temperature?<\/strong> A center wavelength quoted without a reference temperature and a tolerance is not a number you can design to.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What is the coupling efficiency into the delivery fiber, and how was it measured?<\/strong> Fiber-coupled power at the connector is the number that matters to your system. Chip power is not.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfSe examin\u00f3 cada unidad con quemado, o solo una muestra?<\/strong> Diode lasers show early-life failures. Burn-in is the only practical way to find them before they find your customer, and screening every unit costs the supplier real yield \u2014 which is why some skip it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What does the package do about moisture?<\/strong> Hermetic sealing is what keeps facet degradation from accumulating over years in humid or cycled environments. An unhermetic package can look identical on a datasheet and behave very differently at year three.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Is there data across the full operating window?<\/strong> Performance at 25 \u00b0C tells you almost nothing about performance at \u221240 \u00b0C or +70 \u00b0C. Ask for the temperature-cycled data, not the ambient bench test.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is the reasoning behind how we build <a href=\"https:\/\/lumexislaser.com\/es\/solutions\/laser-pumping\/\">fuentes de bomba de diodo acopladas por fibra<\/a>: incoming inspection, chip test, die bonding and chip-on-submount assembly, automated fiber coupling, hermetic sealing by parallel seam welding, then burn-in and full-window temperature cycling before final test. The vertical integration matters less as a marketing point than as a traceability one \u2014 when a unit behaves oddly, we can find out why. You can see the <a href=\"https:\/\/lumexislaser.com\/es\/technology\/\">manufacturing and test capability<\/a> behind that flow, or browse <a href=\"https:\/\/lumexislaser.com\/es\/shop-laser-source-module\/\">m\u00f3dulos de fuente l\u00e1ser disponibles<\/a> si est\u00e1 evaluando una longitud de onda y potencia espec\u00edficas.<\/p>\n\n\n\n<h2 id=\"frequently-asked-questions\" class=\"wp-block-heading\">Preguntas frecuentes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfCu\u00e1l es la diferencia entre bombeo y emisi\u00f3n l\u00e1ser?<\/strong><br>\nEl bombeo introduce energ\u00eda en el medio de ganancia para crear inversi\u00f3n de poblaci\u00f3n. El l\u00e1ser es lo que ocurre despu\u00e9s: la emisi\u00f3n estimulada amplifica la luz dentro de un resonador hasta que se convierte en un haz de salida coherente. El bombeo es la entrada; el l\u00e1ser es el resultado.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfPor qu\u00e9 se utilizan diodos l\u00e1ser para bombear otros l\u00e1seres?<\/strong><br>\nLa emisi\u00f3n del diodo puede ajustarse a una banda de absorci\u00f3n estrecha del medio de ganancia, por lo que casi toda la energ\u00eda de bombeo se absorbe de manera \u00fatil en lugar de convertirse en calor. Las l\u00e1mparas de destello emiten luz de banda ancha, la mayor parte de la cual se desperdicia. Los diodos tambi\u00e9n duran mucho m\u00e1s y funcionan a un voltaje mucho m\u00e1s bajo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfQu\u00e9 es el defecto cu\u00e1ntico en el bombeo l\u00e1ser?<\/strong><br>\nEs la diferencia de energ\u00eda entre un fot\u00f3n de bombeo y un fot\u00f3n l\u00e1ser, liberada como calor en el medio de ganancia. Bombear Nd:YAG a 808 nm para emitir a 1064 nm pierde aproximadamente una cuarta parte de la energ\u00eda del fot\u00f3n de bombeo de esta manera. Esto establece la carga t\u00e9rmica m\u00ednima del dise\u00f1o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfQu\u00e9 significa end pumping?<\/strong><br>\nLa luz de bombeo entra a lo largo del eje del resonador, generalmente a trav\u00e9s de un espejo dicroico, por lo que el volumen bombeado se superpone estrechamente con el modo l\u00e1ser. Esto proporciona alta eficiencia y buena calidad de haz, pero concentra el calor y requiere una fuente de bombeo razonablemente brillante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfNecesitan las bombas de diodos control de temperatura?<\/strong><br>\nNo siempre. La longitud de onda de emisi\u00f3n se desplaza aproximadamente 0,3 nm por \u00b0C, por lo que algunos dise\u00f1os usan un TEC o un diodo estabilizado en longitud de onda. Otros est\u00e1n dise\u00f1ados para funcionar sin TEC eligiendo una banda de absorci\u00f3n tolerante y ajustando la longitud de onda nominal \u2014 m\u00e1s simple y robusto cuando la aplicaci\u00f3n lo permite.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfPor qu\u00e9 se utiliza 976 nm para el bombeo de l\u00e1seres de fibra?<\/strong><br>\nLas fibras dopadas con iterbio y erbio-iterbio tienen una fuerte caracter\u00edstica de absorci\u00f3n cerca de 976 nm. Combinado con el bombeo por revestimiento, esto permite que los diodos acoplados a fibra multimodo impulsen eficientemente una salida de modo \u00fanico \u2014 la base de la mayor\u00eda de los sistemas de l\u00e1ser de fibra de alta potencia y de 1.5 \u00b5m seguros para el ojo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfCu\u00e1les son los principales tipos de bombeo l\u00e1ser?<\/strong><br>\nBombeo \u00f3ptico (l\u00e1mparas de destello o, mucho m\u00e1s com\u00fanmente ahora, diodos l\u00e1ser), bombeo el\u00e9ctrico (una descarga de gas, o corriente a trav\u00e9s de una uni\u00f3n semiconductora) y bombeo qu\u00edmico (energ\u00eda de una reacci\u00f3n). El bombeo \u00f3ptico por diodo se subdivide adem\u00e1s en geometr\u00edas de extremo, lateral, acoplada a fibra y bombeada por revestimiento, y esa elecci\u00f3n de geometr\u00eda suele importar m\u00e1s a un producto que la categor\u00eda en s\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfCu\u00e1l es la diferencia entre el bombeo CW y QCW?<\/strong><br>\nEl bombeo CW hace funcionar el diodo de forma continua con una carga t\u00e9rmica estable. El bombeo QCW lo hace funcionar en pulsos cortos, t\u00edpicamente de unos cientos de microsegundos, alrededor de cada pulso de salida. Debido a que el diodo solo disipa durante una fracci\u00f3n del ciclo, se puede accionar muy por encima de su corriente nominal CW, lo que proporciona una potencia de bombeo m\u00e1xima mucho mayor desde el mismo encapsulado. El QCW es lo que hace pr\u00e1cticos los l\u00e1seres pulsados compactos alimentados por bater\u00eda, como los tel\u00e9metros.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfQu\u00e9 es el bombeo en banda o resonante?<\/strong><br>\nPumping directly into the upper laser level instead of into a higher absorption band that must then relax into it. It cuts the quantum defect sharply \u2014 888\u00a0nm into Nd:YVO<sub>4<\/sub> instead of 808\u00a0nm, or 976\u00a0nm into ytterbium for 1030\u00a0nm output. The cost is weaker absorption, so the crystal or fibre has to be longer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00bfCu\u00e1nto deber\u00eda durar un pulso de bombeo?<\/strong><br>\nOn the order of the gain medium\u2019s upper-level fluorescence lifetime \u2014 roughly 230\u00a0\u00b5s for Nd:YAG, under 100\u00a0\u00b5s for Nd:YVO<sub>4<\/sub>, milliseconds for Er:glass. Pumping much longer than that does not store additional energy; it only adds heat.<\/p>\n\n\n\n<h2 id=\"specifying-the-pump-before-you-specify-the-laser\" class=\"wp-block-heading\">Especificar la bomba antes de especificar el l\u00e1ser<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If you are early in a design, settle the pump questions first: wavelength and its tolerance across your real operating temperature, delivered power at the fiber, geometry, and whether you can live without a TEC. Those four answers constrain the resonator far more than the resonator constrains them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Send us your gain medium, output requirement, and environmental envelope, and <a href=\"https:\/\/lumexislaser.com\/es\/contact\/\">nuestros ingenieros trabajar\u00e1n con usted en las opciones de bomba<\/a> \u2014 including the trade between wavelength stabilization and TEC-less simplicity for your specific platform.<\/p>\n\n\n\n<h2 id=\"references\" class=\"wp-block-heading\">Referencias<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/optical_pumping.html\" target=\"_blank\" rel=\"noopener\">Optical Pumping<\/a><\/li>\n\n\n\n<li>Coherent \u2014 <a href=\"https:\/\/www.coherent.com\/news\/glossary\/laser-pumping\" target=\"_blank\" rel=\"noopener\">What is Laser Pumping?<\/a><\/li>\n\n\n\n<li>Laser Focus World \u2014 <a href=\"https:\/\/www.laserfocusworld.com\/lasers-sources\/article\/14189229\/enhance-your-nd-doped-dpss-laser-with-a-longer-wavelength-pump\" target=\"_blank\" rel=\"noopener\">Enhance your Nd-doped DPSS laser with a longer-wavelength pump<\/a><\/li>\n\n\n\n<li>Gentec-EO \u2014 <a href=\"https:\/\/www.gentec-eo.com\/blog\/population-inversion-in-laser\" target=\"_blank\" rel=\"noopener\">What is population inversion in a laser?<\/a><\/li>\n\n\n\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/quantum_defect.html\" target=\"_blank\" rel=\"noopener\">Quantum Defect<\/a><\/li>\n\n\n\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/upper_state_lifetime.html\" target=\"_blank\" rel=\"noopener\">Upper-state Lifetime<\/a><\/li>\n\n\n\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/brightness.html\" target=\"_blank\" rel=\"noopener\">Brightness<\/a><\/li>\n\n\n\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/double_clad_fibers.html\" target=\"_blank\" rel=\"noopener\">Double-clad Fibers<\/a><\/li>\n\n\n\n<li>RP Photonics Encyclopedia \u2014 <a href=\"https:\/\/www.rp-photonics.com\/wavelength_stabilized_laser_diodes.html\" target=\"_blank\" rel=\"noopener\">Wavelength-stabilized Laser Diodes<\/a><\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>Bombeo l\u00e1ser explicado: inversi\u00f3n de poblaci\u00f3n, bombeo \u00f3ptico vs el\u00e9ctrico, bombeo por extremo vs lateral, defecto cu\u00e1ntico y c\u00f3mo elegir un diodo de bomba que mantenga las especificaciones.<\/p>","protected":false},"author":1,"featured_media":1818,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[41,43],"class_list":["post-1697","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laser-basic-knowledge-101","tag-fiber-coupled-lasers","tag-laser-pumping"],"acf":[],"_links":{"self":[{"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/posts\/1697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/comments?post=1697"}],"version-history":[{"count":6,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/posts\/1697\/revisions"}],"predecessor-version":[{"id":1893,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/posts\/1697\/revisions\/1893"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/media\/1818"}],"wp:attachment":[{"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/media?parent=1697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/categories?post=1697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lumexislaser.com\/es\/wp-json\/wp\/v2\/tags?post=1697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}