报道了一种宽温度适应范围的微型化人眼安全激光器。采用中心波长940 nm的二极管作为泵浦源,Er3+/ Yb3+共掺磷酸盐玻璃作为增益介质,Co2+: MgAl2O4作为被动调Q晶体,研究了微型激光器的结构和激光在宽温度范围下的输出特性。当泵浦能量9 mJ,重复频率10 Hz,泵浦脉宽5 ms时,获得了单脉冲能量130 μJ,脉宽5.5 ns,峰值功率大于20 kW的激光输出,光束质量因子为1.3。采用真空封装工艺,在-40~50 ℃温度范围内,自然冷却方式下激光器稳定输出,功率不稳定性波动小于5%。

A miniaturized, eye-safe laser with wide adaptive temperature is reported. Er3+, Yb3+ co-doped phosphate glass is used as the gain medium. A Co2+: MgAl2O4 crystal is used as the saturable absorber. The miniaturized laser structure suitable for wide temperature range and the output characteristics of the passively Q-switched laser are investigated. The pump energy of 9 mJ, repetition frequency of 10 Hz, pump duration of 5 ms, pulse energy of 130 μJ, pulse duration of 5.5 ns, peak power of 20 kW, and beam quality M2of 1.3 were obtained. The laser structure uses vacuum packaging and can run stably in the temperature range of -40 ℃ to 50 ℃. The output instability is less than 5% by natural cooling. The laser can also be driven by lithium batteries for further application.