A 24.6 kW quasi-continuous-wave (QCW) Nd-doped yttrium aluminum garnet (Nd:YAG) slab laser is proposed in this Letter. The laser is based on a stable-unstable hybrid cavity. A stable and an unstable resonator were constructed along orthogonal directions in the aperture of the slab. Due to features of the hybrid cavity, the slab laser achieves both high efficiency of power extraction with excellent beam quality and compactness with simplicity. Average output power of 24.6 kW with 47% optical-to-optical efficiency is achieved in the experiment. The beam quality of the output beam is 1.5 times diffraction limits after correction of adaptive optics. The repetition frequency and pulse width of the laser are 400 Hz and 200 μs.

中文翻译：

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基于稳定不稳定的混合腔，接近衍射极限的24.6 kW准连续波Nd：YAG平板激光器。

本信中提出了一种24.6 kW准连续波（QCW）掺Nd钇铝石榴石（Nd：YAG）平板激光器。激光器基于稳定不稳定的混合腔。沿平板孔中的正交方向构造一个稳定和不稳定的谐振器。由于混合腔的特性，平板激光器既可以实现高效的功率提取效率，又具有出色的光束质量，并且结构紧凑，简便。在实验中，平均输出功率为24.6 kW，光效率为47％。校正自适应光学元件后，输出光束的光束质量为衍射极限的1.5倍。激光的重复频率和脉冲宽度为400 Hz和200μs。