Title: 24.6 kW near diffraction limit quasi-continuous-wave Nd:YAG slab laser based on a stable-unstable hybrid cavity 

Author(s): Guo, YD (Guo, Yading); Peng, QJ (Peng, Qinjun); Bo, Y (Bo, Yong); Chen, ZZ (Chen, Zhongzheng); Li, Y (Li, Yang); Zhang, L (Zhang, Lin); Shao, CF (Shao, Chongfeng); Yuan, L (Yuan, Lei); Wang, BS (Wang, Baoshan); Xu, J (Xu, Jian); Xu, JL (Xu, Jialin); Gao, HW (Gao, Hongwei); Xu, YT (Xu, Yiting); Lai, BH (Lai, Boheng); Su, CX (Su, Chunxuan); Ma, SQ (Ma, Shiqing); Cheng, T (Cheng, Tao) 

Source: OPTICS LETTERS  Volume: 45  Issue: 5  Pages: 1136-1139  DOI: 10.1364/OL.385387  Published: MAR 1 2020   

Abstract: A 24.6 kW quasi-continuous-wave (QCW) Nd-doped yttrium aluminum garnet (Nd:YAC) 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 t he laser are 400 Hz and 200 mu s. (C) 2020 Optical Society of America 

ISSN: 0146-9592 

eISSN: 1539-4794