High efficiency electrically-addressable phase-only spatial light modulator

被引:125
作者
Igasaki, Y
Li, FH
Yoshida, N
Toyoda, H
Inoue, T
Mukohzaka, N
Kobayashi, Y
Hara, T
机构
[1] Hamamatsu Photon KK, Cent Res Lab, Hamakita 4348601, Japan
[2] Zhejiang Univ, State Key Lab Modern Opt Instrumentat, Hangzhou 310027, Peoples R China
关键词
spatial light modulator; liquid crystal display; phase-only modulator; diffraction efficiency; oblique incident; phase modulation; amorphous silicon; liquid crystal;
D O I
10.1007/s10043-999-0339-2
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
To realize a high efficiency electrically addressable phase-only modulator, we have coupled a liquid crystal display (LCD) to an optically addressed parallel-aligned nematic liquid crystal spatial light modulator (PAL-SLM) with a set of lenses. Phase modulation exceeding 3 pi at 532 nm wavelength was obtained. We obtained linear transfer characteristics for phase modulation at various desired phase levels after calibration and adjustment of the transfer characteristics of the PAL-SLM and the LCD. Diffraction efficiency of 40% for binary phase grating and of 90% for 8-level blazed phase grating, which were very close to the simulation values, were observed. The power loss of the readout light was caused when passed through a half mirror, therefore, we examined a setup using an oblique readout light at the modulator. Very high diffraction efficiency was obtained from the setup by optimizing the polarization direction and optical path for this light, and the orientation of liquid crystals. Since the modulator can perform at better than 90% diffraction efficiency and at nearly 100% reflectivity, various high efficiency systems utilizing such modulators are expected.
引用
收藏
页码:339 / 344
页数:6
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