用于激光放大器的强迫流动湍流面冷却的指数调平
Index-leveling for forced-flow turbulent face-cooling of laser amplifiers
摘要：
利用流体直接冷却激光板条端面是获得高平均激光功率的一种重要方法。然而，流态通常保持在低雷诺数，以防止流中湍流特征的发生，这将降低波前质量。我们在这里展示了如何使流体温度的热光零点，接近水/冰过渡的情况下，水，允许一个减轻流体动力学不稳定性的光学后果，漂白光学内的温度不均匀性流。这种光学过程被称为“指数水平”，为高效强制流动、弱湍流的表面冷却机制打开了大门，这将有助于提高下一代高功率激光器的千瓦能力。
英文摘要：
Direct laser slab face-cooling by a fluid crossing the main and pump laser beams is an important method to reach high average laser powers. However, the flow regime is usually maintained at low Reynolds numbers, to prevent the onset of turbulence features in the flow, that would degrade wavefront quality. We show here how bringing the fluid temperature to the thermo-optical null point, close to the water/ice transition in the case of water, allows one to mitigate the optical consequences of hydrodynamic instabilities, by bleaching optically the temperature inhomogeneities within the flow. This optical process, dubbed 'index-leveling', opens the door to a highly efficient forced-flow, weakly turbulent face-cooling regime that should be instrumental to boost the kilowatt capabilities of next generation high-power lasers.
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