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Proceedings Paper

Compact high-efficiency electrically addressable phase-only spatial light modulator
Author(s): Yuji Kobayashi; Yasunori Igasaki; Narihiro Yoshida; Norihiro Fukuchi; Haruyoshi Toyoda; Tsutomu Hara; Ming Hsien Wu
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Paper Abstract

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.

Paper Details

Date Published: 10 March 2000
PDF: 8 pages
Proc. SPIE 3951, Diffractive/Holographic Technologies and Spatial Light Modulators VII, (10 March 2000); doi: 10.1117/12.379364
Show Author Affiliations
Yuji Kobayashi, Hamamatsu Photonics KK (Japan)
Yasunori Igasaki, Hamamatsu Photonics KK (Japan)
Narihiro Yoshida, Hamamatsu Photonics KK (Japan)
Norihiro Fukuchi, Hamamatsu Photonics KK (Japan)
Haruyoshi Toyoda, Hamamatsu Photonics KK (Japan)
Tsutomu Hara, Hamamatsu Photonics KK (Japan)
Ming Hsien Wu, Hamamatsu Corp. (United States)


Published in SPIE Proceedings Vol. 3951:
Diffractive/Holographic Technologies and Spatial Light Modulators VII
Ivan Cindrich; Sing H. Lee; Richard L. Sutherland, Editor(s)

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