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以Cr:YAG作为可饱和吸收体,实现了激光二极管(LD)端面抽运Nd:GdVO4晶体的微片式被动调Q激光器。Nd:GdVO4晶体的尺寸为3 mm×3 mm×1 mm,a向切割,Nd3+掺杂原子数分数为0.5%,抽运端面镀有对808 nm增透和对1.06μm高反的双色膜,作为激光谐振腔的输入镜。Cr4+:YAG的尺寸为9.5 mm×1.1 mm,初始透射率为77%,其外端面镀有对1.06μm透射率为15%的部分反射膜,作为激光谐振腔的输出镜。谐振腔的长度为5~6 mm。激光的抽运阈值为4.62 W,当抽运功率为13.86 W时,最大平均输出功率为0.98 W,相应的光光转换效率为7%,斜率效率为9.5%,最高重复频率、最大单脉冲能量和最短脉冲宽度分别为23.4 kHz,44.6μJ和2.9 ns,相应的峰值功率为15.4 kW。
By using Cr: YAG as a saturable absorber, a chip-type passive Q-switched laser with Nd: GdVO4 crystal was pumped by laser diode (LD) end-facet. The size of Nd: GdVO4 crystal is 3 mm × 3 mm × 1 mm, and a is cut in a direction. The Nd3 + doped atomic fraction is 0.5%. The pumped end is coated with a bichromal film that is transparent to 808 nm and highly reflective to 1.06 μm. As the laser resonator input mirror. The size of Cr4 +: YAG is 9.5 mm × 1.1 mm. The initial transmittance is 77%. The outer surface of the Cr4 +: YAG is partially coated with a reflection film with a transmittance of 15% at 1.06μm as the output mirror of the laser resonator. The length of the resonator is 5 ~ 6 mm. The pumping threshold of the laser is 4.62 W, the maximum average output power is 0.98 W when the pumping power is 13.86 W, the corresponding light-to-light conversion efficiency is 7%, the slope efficiency is 9.5%, the maximum repetition frequency and the maximum single-pulse energy And the shortest pulse width were 23.4 kHz, 44.6 μJ and 2.9 ns respectively, with a corresponding peak power of 15.4 kW.