期刊
OPTICS COMMUNICATIONS
卷 236, 期 4-6, 页码 313-322出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2004.03.043
关键词
multi-phase modulation; liquid crystal SLM; LCoS devices
类别
In phase modulating diffractive optical devices multi-phase modulation provides improved performance over binary modulation. Multi-phase modulation can be achieved by using nematic liquid crystal spatial light modulators (NLCSLM) with pulse-width modulation driven from a binary CMOS backplane. This paper presents the characteristics and the driving scheme of the 512 x 512 Si-backplane SLM for the implementation of the multi-phase modulation while comparing the binary and four-level phase holograms. Diffraction efficiency of 39.7% for binary grating and 72.9% for four-level blazed grating were obtained at the spatial frequency 1.56 lines/mm. (C) 2004 Elsevier B.V. All rights reserved.
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