本文通过理论推导给出了脉冲染料激光器由多块不同棱镜构成的扩束系统和光栅组合后多程色散的通用计算公式．同时本文也指出光栅与棱镜组合的正确光路安排，从而加大整个系统的色散，减少输出线宽 In this paper, a general formula of pulsed dye laser with a plurality of different prisms and a multi-pass dispersion after grating combination is given. At the same time this paper also pointed out that the grating and prism combination of the correct optical circuit arrangement, thereby increasing the dispersion of the entire system to reduce the output line width