Stratified volume diffractive optical elements as high-efficiency gratings

We propose stratified volume diffractive optical elements as a new type of diffractive optical element that is capable of functioning as a high-effici ency grating in applications with requirements not suited to traditional ho lographic or diffractive optical techniques. In this approach, diffractive optical fabrication methods are used to construct an optical structure that emulates volume grating behavior. We discuss the diffraction properties of stratified volume difffactive optical elements and compare them with those used previously in both volume holographic optical elements and stratified volume holographic optical elements. A systematic design process is then p resented for deriving structure parameters. We illustrate this process by d esigning a prototype stratified volume difffactive optical element to meet the operational specifications for a beam-scanning element in a spaceborne coherent wind lidar. We use numerical simulation to assess the performance of the prototype element, including sensitivity to fabrication errors. (C) 1999 Optical Society of America [S0740-3232(99)01105-9].