论文标题
索引级别用于强制流动的激光放大器的湍流面部冷却
Index-leveling for forced-flow turbulent face-cooling of laser amplifiers
论文作者
论文摘要
通过越过主和泵激光束的流体进行直接激光板面部冷却是达到高平均激光功率的重要方法。但是，流动状态通常保持在较低的雷诺数上，以防止流动中的湍流特征发作，从而降低波前质量。我们在这里显示，在水中，如何将流体温度带入靠近水/冰过渡的热光零点，使人们可以通过光化流动中的温度不均匀性来减轻流体动力不稳定性的光学后果。这个被称为“索引级别”的光学过程为高效的强迫流动，易于动荡的面部冷却制度打开了大门，这对于增强下一代高功率激光器的Kilowatt功能应该具有重要意义。
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.
