A low-order wavefront aberration self-compensation high power Nd:YAG slab laser module is developed and demonstrated. By numerical simulating the thermal distribution and transmission wavefront of the slab laser medium, a thermally-compensated heat removal geometry is developed to reduce the wavefront distortion. This method allows the non-uniform cooling to flatten the thermal gradient distribution in the width direction of the slab. By using the optimized gain module as an amplifier, the laser output power of 7.8 kW is achieved. Compared to the traditional module, the output power is 7.3 kW, and the peak-to-valley (PV) value of the wavefront distortion is reduced from 17.21 to $2.05~\mu \text{m}$ under full power, the beam quality factor $\beta $ is improved from 12.7 to 3.5 times diffraction limited while without additional correction system.

中文翻译：

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具有低波前畸变的热补偿大功率 Nd:YAG 板条激光模块

开发并演示了低阶波前像差自补偿大功率 Nd:YAG 板条激光器模块。通过数值模拟板条激光介质的热分布和传输波前，开发了一种热补偿散热几何结构，以减少波前畸变。这种方法允许非均匀冷却使板坯宽度方向上的热梯度分布变平。通过使用优化的增益模块作为放大器，实现了 7.8 kW 的激光输出功率。与传统模块相比，输出功率为7.3 kW，波前畸变峰谷（PV）值从17.21降低到 $2.05~\mu \text{m}$ 在全功率下，光束品质因数 $\beta $ 在没有额外校正系统的情况下，衍射极限从 12.7 倍提高到 3.5 倍。