Chonion R, Sajer J M, Bordenave E, Le Palud F, Dalbies P M, Neauport J
Opt Express. 2020 Jul 6;28(14):20162-20176. doi: 10.1364/OE.394271.
High repetition rates in high energy solid-state laser systems can yield to a rise of temperature in amplifiers despite the use of cooling systems. This effect can significantly impact the performance of amplifiers by inducing thermal stress, birefringence or thermal lensing. Here, we develop a multiphysics model to support the design, optimization and commissioning of a liquid-cooled large aperture split-slab laser glass amplifier. This multiphysics model includes optical pumping in the amplifying medium, heat loading, hydraulic effects induced by the liquid coolant, mechanical deformation and their potential coupled effects on the optical wavefront. The accuracy of each model is assessed by carrying out specific experimental measurements and characterizations. We show that this set of models allows the prediction of performance of a liquid-cooled amplifier from the flash-lamp emission to the amplified wavefront at a repetition rate of one shot per minute.
尽管使用了冷却系统，但高能固态激光系统中的高重复频率仍会导致放大器温度升高。这种效应会通过引起热应力、双折射或热透镜效应，显著影响放大器的性能。在此，我们开发了一个多物理场模型，以支持液冷大口径分体平板激光玻璃放大器的设计、优化和调试。该多物理场模型包括放大介质中的光泵浦、热负载、液体冷却剂引起的水力效应、机械变形以及它们对光波前的潜在耦合效应。通过进行特定的实验测量和表征来评估每个模型的准确性。我们表明，这组模型能够预测液冷放大器从闪光灯发射到放大光波前在每分钟一次重复频率下的性能。
