摘要
基于两元相位光栅的自成像效应和相位补偿的原理,本文提出了两元光学的一种新的双相位光栅光调制器。用菲涅耳衍射理论导出了任意光束的解析解,进行了高斯光束的计算机模拟。表明调制度正比于光束直径而反比于两光栅的间距,最后给出了实验。
A novel light modulator based on binary optics is proposed, which is consisted of two binary π/2 phase gratings, one for self-imaging and the other for phase compensation. An analytic expression for the modulation of any form of incident wave-front is obtained by using the Fresnel diffraction theory. Numerical simulations on the zero-order diffraction of Gaussian beams are given. It is concluded that tho modulability is directly proportional to the beam radius and reversely to the distance between the two gratings. Experiments results are given, too.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1990年第1期40-45,共6页
Chinese Journal of Lasers
基金
国家自然科学基金项目
关键词
两元光学
光调制器
相位
光栅
binary phass grating, Talbot effeet, lignt modulation, Gaussian beam
