as a method to obtain higher sbs reflectivity by improving the monochromaticity of laser system, the ld end-pumped pulse-microchip laser operated on high-repetition and single-frequency has also been researched . in section v, we revised the previous theoretical model for passive-q-switched laser using cr4 + : nd3 + : yag by introducing the space dependence between the photons and inversion populations in microchip resonator 由于泵浦激光的线宽对sbs反射率有显著影响,而利用单纵模、高重复频率运转的脉冲微片激光器作为dpl系统种子光源来提高激光系统单色性是一种可行的技术方案。