固体激光器的最佳亮度
Optimised brightness from solid-state lasers
摘要：
激光亮度是将强光传递到目标的能力的量度，并且包含能量含量和光束质量。高亮度激光器要求两个参数都最大化，但标准激光腔不允许这样。例如，在固体激光器中，多模光束具有高能量含量但光束质量低，而高斯模式具有小的模式体积，因此具有低能量提取，但处于良好质量模式。在这里，我们克服了这个基本的限制，并展示了一种实现高亮度激光器的最佳方法。我们采用腔内光束整形来产生高斯模式，该模式携带多模光束的所有能量，因此能量提取和光束质量同时最大化。这对未来高亮度激光腔的设计具有重要的指导意义。
英文摘要：
Laser brightness is a measure of the ability to de- liver intense light to a target, and encapsulates both the energy content and the beam quality. High brightness lasers requires that both parameters be maximised, yet standard laser cavities do not allow this. For example, in solid-state lasers multimode beams have a high energy content but low beam quality, while Gaussian modes have a small mode volume and hence low energy extraction, but in a good quality mode. Here we over- come this fundamental limitation and demonstrate an optimal approach to realising high brightness lasers. We employ intra- cavity beam shaping to produce a Gaussian mode that carries all the energy of the multimode beam, thus energy extraction and beam quality are simultaneously maximised. This work will have a significant influence on the design of future high brightness laser cavities.
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