二元光学分束器输出稳定性的优化设计

OPTIMAL DESIGN FOR THE OUTPUT SENSITIVITY OF A BINARY OPTICS BEAM SPLITTER

提出将微分－积分法用于二元光学分束器的设计，以改善其输出对输入变化的敏感性。模拟计算表明，使用这种方法设计的分束器，当输入光束形状和强度变化时，目标光强分布保持一定程度的稳定性，衍射效率达到９２．６７％，光强不均匀性小于０．００２％。当输入由基模高斯波变为超高斯波或带有微小随机起伏的矩形光斑和平面波时，衍射效率最低仍能达到８９．６０％以上，光强不均匀性最高为１１．４９％。综合衍射效率与光强不均匀性两方面考虑。

In this paper,we use differential integral algorithm for optimal design of the binary optics beam splitter.Though the simulate result we can see,splitter designed by this method,when the shape and the intensity of the input changes,the output will keep relatively stable.The designed diffraction efficiency achieved 92 67%,and the nonuniformity of the intensity less than 0 002%.When the input changes from a Gaussian to a paranomal Gaussian,a rectangular facula with tiny random undulationa and a plane wave,the diffraction efficiency could reach 89 60% at least,and the highest nonuniformity of the intensity is 11 49%.Consider about both the diffraction efficiency and the nonuniformity of the intensity,this result better than that has been reported.