Tunable phase-only optical filters with a uniaxial crystal.
A novel method of fabricating phase-only optical filters that is based on the properties of a uniaxial crystal is proposed. With these optical filters, the phase differences are tunable among the different filter zones. Many focal patterns can be obtained if these optical filters are placed in front of a lens; furthermore, these optical filters can also be used to make up for the distortions in fabrications in which they were used only as untunable optical filters.
Xiao
Fanrong
F
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China. frxiao@siom.ac.cn
Yuan
Jinghe
J
Wang
Guiying
G
Xu
Zhizhan
Z