红外与激光工程, 2017, 46 (2): 0205003, 网络出版: 2017-03-31  

脉冲半导体泵浦掠入射Nd:YVO4板条振荡器储能优化

Energy storage optimization of grazing incident Nd:YVO4 slab oscillator pumped by pulsed laser diode
作者单位
北京工业大学 激光工程研究院, 北京 100124
摘要
板条放大器中寄生振荡的存在严重影响了激光放大器的效率, 降低了板条晶体的储能。为抑制掠入射板条寄生振荡、提高晶体储能, 对掠入射板条放大器的增益介质Nd:YVO4晶体进行了表面处理。该处理用离子溅射的方法, 对板条的上下两个梯形面和梯形长边所在的矩形面镀锗, 抑制板条内部的寄生振荡。通过实验对镀锗和未镀锗板条振荡器的自由振荡输出和调Q输出特性进行了对比, 镀锗板条振荡器在调Q下的阈值电流降低了15%, 晶体的储能提高了86.9%; 而两种板条在调Q条件下输出的光束质量、脉宽大小、光斑形状基本一致。实验结果表明, 板条表面镀锗是抑制其内部寄生振荡、提高储能的有效方法。
Abstract
Parasitic oscillation in the slab amplifier affects the efficiency of laser amplifier and reduces the stored energy of slab crystal. The surface of Nd:YVO4, gain of grazing incident slab amplifier was processed to suppress the parasitic oscillation in the slab and improve the energy storage ability of slab crystal. Through ion sputtering method, the germanium was plated on top and bottom surface and the back surface to suppress the parasitic oscillation. In germanium plated and without germanium plated conditions, the slab oscillator′s output characteristics were compared between free oscillation and Q-switched mode, threshold current reduced 15% in plating germanium slab oscillator, and the stored energy improved 86.9%. The beam quality, pulse duration and spot pattern of plating germanium slab oscillator were basically the same to without plating germanium slab oscillator in Q-switched mode. Experimental result indicates plating germanium on the face of slab is an effective method to suppress the parasitic oscillation and improve the energy storage ability of crystal.

李之通, 于灏洋, 程思齐, 姜梦华, 惠勇凌, 雷訇, 李强. 脉冲半导体泵浦掠入射Nd:YVO4板条振荡器储能优化[J]. 红外与激光工程, 2017, 46(2): 0205003. Li Zhitong, Yu Haoyang, Cheng Siqi, Jiang Menghua, Hui Yongling, Lei Hong, Li Qiang. Energy storage optimization of grazing incident Nd:YVO4 slab oscillator pumped by pulsed laser diode[J]. Infrared and Laser Engineering, 2017, 46(2): 0205003.

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