针对铯蒸气激光器对窄线宽与高稳定852 nm半导体激光抽运源的要求，采用体布拉格(Bragg)光栅作为外腔输出镜，研究了体Bragg光栅衍射效率对外腔半导体激光器输出光谱特性的影响。研究结果表明，衍射效率为24%、32%与37%的体布拉格光栅均能够改善半导体激光器输出光谱特性；输出光束中心波长锁定在852 nm附近、输出线宽约为0.26 nm；外腔半导体激光器输出波长随抽运电流、温度的变化速率分别小于10.4 pm/A、7.2 pm/℃，优于自由运行半导体激光器；随着光栅衍射效率增加，全系统外腔效率从91%降低至86%。

As referred to the laser diode with wavelength stabilization and linewidth narrowing required in pumping Cesium vapor lasers, volume Bragg gratings are employed as the external cavity output mirror and the effect of volume Bragg gratings with different diffraction efficiencies on output spectrum of external cavity laser diode is studied. It is demonstrated that the volume Bragg gratings with diffraction efficiencies of 24%, 32% and 37% can improve the laser′s output spectrum apparently. The lasing central wavelength is locked at 852 nm, and the linewidth is narrowed to 0.26 nm. The output wavelength rates of pumping current and operating temperature are less than 10.4 pm/A and 7.2 pm/℃, respectively. With the increase of diffraction efficiency, the external cavity ratio of this system is reduced from 91% to 86%.