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报道了一种应用于激光测距的Er~(3+),Yb~(3+):glass/Co~(2+):MgAl_2O_4复合材料LD泵浦的被动调Q微型激光器。采用玻璃与晶体复合技术,将增益介质Er~(3+)/Yb~(3+)共掺磷酸盐玻璃和被动调Q可饱和Co~(2+):MgAl_2O_4晶体进行了光学热复合,复合材料会降低增益介质内部的温度梯度,使热焦距变长,模体积增加,激光光束质量提高;另外,复合材料使腔内损耗减小,腔内的粒子数密度提高,脉宽变窄,输出能量增加,从而激光器性能得到提高。在重复频率为10 Hz情况下,采用中心波长为940nm的单管LD作为泵浦源,获得单脉冲能量为210μJ、脉冲宽度为2.8ns,峰值功率大于70kW的波长为1.5μm的被动调Q激光输出,光束质量为1.2。
A passive Q-switched Q-switched LD laser with Er ~ (3 +) and Yb ~ (3 +): glass / Co ~ (2 +): MgAl_2O_4 composite LDs for laser ranging was reported. Glass / crystal composite technology was used to optically recombine Er3 + / Yb3 + co-doped phosphate glass with passive Q-tunable Co2 +: MgAl2O4 crystal. The material will reduce the temperature gradient inside the gain medium, so that the thermal focal length becomes longer, the mold volume increases, and the laser beam quality increases. In addition, the composite material reduces the cavity loss, increases the number density of particles in the cavity and narrows the pulse width, The energy is increased, so the laser performance is improved. At a repetition rate of 10 Hz, a single-tube LD with a center wavelength of 940 nm was used as a pump source to obtain a passive Q-switched laser with a wavelength of 1.5 μm with a single pulse energy of 210 μJ, a pulse width of 2.8 ns and a peak power of more than 70 kW Output, beam quality of 1.2.