设计多等分高效率激光分束器的新方法

A NEW METHOD OF DESIGNING HIGH-EFFICIENCY MULTI-BEAM LASER-SPLITTER(BINARY PHASE GRATING)

提出了一种设计二进制位相光栅的新方法.它直接从位相物体振幅透过率的一般公式出发,运用傅里叶积分,求得二进制位相光栅各级衍射光强度的通式.不仅使这一过程的物理含义更清楚,也使计算工作更加简化.还介绍了使用搜索法及迭代法设计高效多光束激光分束器的例子;也对制备光栅的过程及实验结果作了说明.

A new method for the design of binary phase grating is pre- sented.The series density formulae of the binary phase grating are obtained from the general complex amplitude transmittance formulae through Fourier integral.This approach simplifies the operation of the design of phase grat- ing and provides a better understanding of the general formulae.Some ex- amples of the design and preparation of the phase grating are discussed.