Wang Ke, Tu Bo, Jia Chunyan, Shang Jianli, An Xiangchao, Liao Yuan, Xu Zhi, Guo Jingwei, Yi Jiayu, Yu Yi, Su Hua, Gao Qingsong, Wang Xiaojun, Liu Wanfa, Zhang Kai
Opt Express. 2016 Jun 27;24(13):15012-20. doi: 10.1364/OE.24.015012.
A direct-liquid-cooled side-pumped Nd:YAG multi-disk QCW laser resonator is presented, in which the oscillating laser propagates through multiple thin disks and cooling flow layers in Brewster angle. Twenty Nd:YAG thin disks side-pumped by LD arrays are directly cooled by flowing deuteroxide at the end surfaces. A laser output with the highest pulse energy of 17.04 J is obtained at the pulse width of 250 μs and repetition rate of 25 Hz, corresponding to an optical-optical efficiency of 34.1% and a slope efficiency of 44.5%. The maximum average output power of 7.48 kW is achieved at the repetition rate of 500 Hz. Due to thermal effects, the corresponding optical-optical efficiency decreases to 30%. Under the 12.5 kW pumping condition while not oscillating, the wavefront of a He-Ne probe passing through the gain module is as low as 0.256 μm (RMS) with the defocus and tetrafoil subtracted.
介绍了一种直接液冷侧面泵浦的Nd:YAG多盘QCW激光谐振腔，其中振荡激光以布儒斯特角穿过多个薄盘和冷却流层。由LD阵列侧面泵浦的20个Nd:YAG薄盘在端面通过流动的重水直接冷却。在脉冲宽度为250μs、重复频率为25Hz时获得了最高脉冲能量为17.04J的激光输出，对应的光光效率为34.1%，斜率效率为44.5%。在重复频率为500Hz时实现了7.48kW的最大平均输出功率。由于热效应，相应的光光效率降至30%。在12.5kW泵浦条件下且不振荡时，通过增益模块的He-Ne探针的波前在减去离焦和四叶像差后低至0.256μm（均方根）。
