10 March 2000 Compact high-efficiency electrically addressable phase-only spatial light modulator
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Proceedings Volume 3951, Diffractive/Holographic Technologies and Spatial Light Modulators VII; (2000) https://doi.org/10.1117/12.379364
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
A compact electrically-addressable spatial light phase modulator module is described. The module consists of an electrically-addressed liquid crystal display (LCD), an optically-addressed phase-only spatial light modulator (SLM), one of which substrates is a fiber optic plate (FOP), a laser diode, and collimating optics for it. The module size is 95 mm long, 55 mm wide, and 90 mm high. The module had a nearly 100% reflectivity and a diffraction efficiency close to the theoretical maximum. Surplus diffraction light caused by the pixelized structure was reduced to approximately 3%, almost 50% of which was in the LCD alone. A reflection type of SLM would cause another power loss of the readout light by a half mirror, which was set up so as to separate the incident and reflected lights. An oblique incidence readout method was evaluated in the module, instead of the half mirror scheme, for the readout. We have found adequate alignments among the polarization and incident directions of the readout light, and the corresponding liquid crystal orientation. Consequently, almost no degradation in diffraction efficiency was observed for the incident angle within 45 degrees.
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Yuji Kobayashi, Yuji Kobayashi, Yasunori Igasaki, Yasunori Igasaki, Narihiro Yoshida, Narihiro Yoshida, Norihiro Fukuchi, Norihiro Fukuchi, Haruyoshi Toyoda, Haruyoshi Toyoda, Tsutomu Hara, Tsutomu Hara, Ming Hsien Wu, Ming Hsien Wu, "Compact high-efficiency electrically addressable phase-only spatial light modulator", Proc. SPIE 3951, Diffractive/Holographic Technologies and Spatial Light Modulators VII, (10 March 2000); doi: 10.1117/12.379364; https://doi.org/10.1117/12.379364

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