为解决机载远程单光子测距激光器热稳定性差、受背景光噪声影响大的问题，提出了一种适用于机载环境的小型化、窄线宽、低能耗激光器设计方案。激光器采取主振荡功率放大构型。种子源激光器使用反射式体布拉格光栅作为耦合输出镜，在重复频率为10 kHz条件下，获得线宽为0.035 nm激光输出，光束质量为Mx2=1.303，My2=1.271，光光转换效率为44.4%；放大器选用innoslab构型放大激光能量，可以有效缓解热问题、提升光束质量。为此，采用蒙特卡罗方法建立单光子测距回波信号模型，验证了提高激光器性能可以降低激光抖动对精度的影响，同时较窄的线宽输出可以采用相匹配的窄带滤光片来减少背景噪声干扰，从而提高测距精度。

In order to solve the problem of poor thermal stability and large influence of background light noise of the airborne long-distance single photon ranging laser， a design of the miniaturized， narrow line width， and low-energy laser suitable for an airborne environment is proposed. The laser adopts the main oscillation power amplification configuration. The seed source laser uses a reflecting volume Bragg grating as the coupling output mirror. Under the condition of 10 kHz repetition rate， the laser output with a line width of 0.035 nm is obtained， and the beam quality is Mx2=1.303 and My2=1.271. The optical-optical conversion efficiency is 44.4%. The amplifier adopts the innoslab configuration to amplify the laser energy， effectively alleviating the thermal problem and improving the beam quality. The Monte Carlo method is used to establish a single-photon ranging echo signal model， which verifies that improving laser performance can reduce the impact of laser jitter on accuracy. At the same time， the narrower linewidth output can use a matched narrowband filter to reduce background noise interference， thereby improving the accuracy of ranging.