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Amplification characteristics of a cryogenic Yb~(3+):YAG total-reflection active-mirror laser

机译：低温Yb〜（3 +）：YAG全反射有源镜激光的放大特性

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摘要

We have studied the amplification characteristics of a cryogenically cooled Yb~(3+):YAG total-reflection active-mirror (TRAM) ceramic laser including wavefront distortion, birefringence loss, small signal gain (SSG), and temperature rise for developing high-performance master oscillator power amplifier (MOPA) systems. A 0.6 mm thick Yb~(3+):YAG ceramic sample was used, and maximum pump intensity ～10 kW/cm~2 was reached. The transmitted wavefront was measured by using a Shack-Hartmann wave-front sensor, and we evaluated the thermal lens focal length and Strehl ratio for different pump conditions. We have also observed a butterfly-like leakage profile of thermally induced birefringence loss at the maximum pump intensity. From SSG measurements, we obtained moderate laser gain of G = 3 for one bounce with a near aberration-free wavefront. Gain calculations, which included also temperature dependence of the emission cross section and reabsorption of Yb~(3+):YAG, were in good agreement with the experiments. These experimental results will be useful as benchmark data for numerical simulations of temperature distribution in TRAM and for designing multikilowatt-class high-performance MOPA systems.
机译：我们研究了一种低温冷却的Yb〜（3 +）：YAG全反射有源镜（TRAM）陶瓷激光器的放大特性，包括波前畸变，双折射损耗，小信号增益（SSG）和温升，以开发出高能性能主振荡器功率放大器（MOPA）系统。使用厚度为0.6 mm的Yb〜（3 +）：YAG陶瓷样品，泵浦最大强度达到〜10 kW / cm〜2。通过使用Shack-Hartmann波前传感器测量透射的波前，我们评估了不同泵浦条件下的热透镜焦距和Strehl比。我们还观察到在最大泵浦强度下，热诱导的双折射损失呈蝴蝶状泄漏。从SSG测量中，我们获得了近乎无像差波前的1次反射的G = 3的中等激光增益。增益计算包括发射截面的温度依赖性和Yb〜（3 +）：YAG的重吸收，与实验吻合良好。这些实验结果将作为基准数据，用于TRAM中温度分布的数值模拟以及设计多千瓦级高性能MOPA系统。

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