半导体激光器给出的是半功率点处的发散角，在计算时必须进行变换，因实测ＬＯＣ激光器发散角较大，本文对高斯光束发散角变换公式进行了少许修正，导出了模拟器衍射损耗公式，并计算了三种模拟器的衍射损耗 The semiconductor laser gives the divergence angle at the half-power point, which must be transformed in the calculation. Because the divergence angle of the LOC laser is larger, this paper modifies the Gaussian beam divergence angle formula a little and derives the formula of the diffraction loss of the simulator , And calculated the diffraction loss of the three simulators