We present a low-cost multimode diode pumped passively Q-switched Cr:LiCAF laser operating near 800 nm. AlGaAs-based saturable Bragg reflectors (SBRs) were used for passive Q-switching. The system is experimentally characterized in detail using four different output couplers and two SBRs with different modulation depths. Pulse widths in the 1.5–4 µs range at repetition rates between 18 and 40 kHz were achieved with average powers up to 125 mW. The experimentally obtained results are compared with basic Q-switching theory and further performance improvement in terms of pulse length shortening and peak power scaling is elaborated.

我们提出了一种在800 nm附近工作的低成本多模二极管泵浦的无源Q开关Cr：LiCAF激光器。基于AlGaAs的可饱和布拉格反射器（SBR）用于无源Q开关。使用四个不同的输出耦合器和两个具有不同调制深度的SBR对系统进行详细的实验表征。以18 mW至40 kHz的重复频率实现1.5–4 µs的脉冲宽度，平均功率高达125 mW。将实验获得的结果与基本的Q开关理论进行比较，并在缩短脉冲长度和调整峰值功率方面进一步改善了性能。