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6 December 2001 Electrically addressed spatial light phase modulator
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A nonpixelized electrically addressable spatial light phase- only modulator has been developed. The device consists of an optically addressed parallel aligned nematic liquid crystal spatial light modulator (PAL-SLM), coupling optics, an XGA liquid crystal display (LCD) which serves as an accurate addressable mask for the PAL-SLM, a laser diode (LD) for illuminating the LCD and collimating optics for the LD. The device has a phase modulation capability of over 2(pi) radians and a high diffraction efficiency of greater than 35% at a spatial frequency of 10 lp/mm of binary (0,(pi) ) grating. Also when a multilevel (0, 0.5(pi) , (pi) , 1.5(pi) ) grating was written in the device, a diffraction efficiency of greater than 70% at a spatial frequency of 10 lp/mm was obtained. Moreover, surplus diffraction light (diffraction noise) caused by the pixelized structure was reduced to less than 3% by the coupling optics, compared with almost 50% occurring in the LCD by itself.
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Tsutomu Hara, Norihiro Fukuchi, Yuji Kobayashi, Narihiro Yoshida, Yasunori Igasaki, and Ming Hsien Wu "Electrically addressed spatial light phase modulator", Proc. SPIE 4470, Photonic Devices and Algorithms for Computing III, (6 December 2001);

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