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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:YVO_4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。
The existence of parasitic oscillation in the slab amplifier seriously affects the efficiency of the laser amplifier and reduces the energy storage of the slab crystal. In order to suppress the parasitic oscillation of the grazing incidence slab and improve the energy storage of the crystal, the Nd: YVO 4 crystal, which is the gain medium of the grazing incidence slab amplifier, was surface-treated. In this process, ion plating is used to coat germanium on the upper and lower two trapezoidal surfaces of the slab and the rectangular surface on which the long trapezoidal edge is located to suppress parasitic oscillation in the slab. By comparing the free-oscillation output of the germanium-plated and non-germanium-plated slab oscillators with the Q-switched output characteristics, the threshold current of the germanium slab oscillator is reduced by 15% at Q-switching and the energy storage of the crystal is improved 86.9%. The beam quality, pulse width and spot shape of the two kinds of slabs under the condition of Q-adjusting are basically the same. The experimental results show that the germanium plating on the slab surface is an effective way to suppress its internal parasitic oscillation and improve energy storage.