Stable photorefractive square-law conversion using moving grating techniques

We demonstrate a technique by which the temporal oscillations in the response of a photorefractive square-law converter, a recently developed high-contrast spatial light modulator, may be removed. This technique uses the translation of an amplitude grating incoherently imaged upon a photorefractive...

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Published in:Applied optics (2004) 1992-04, Vol.31 (11), p.1783-1786
Main Authors: Vachss, F, Hong, J, Campbell, S, Cordeiro, D
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Language:English
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container_title Applied optics (2004)
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creator Vachss, F
Hong, J
Campbell, S
Cordeiro, D
description We demonstrate a technique by which the temporal oscillations in the response of a photorefractive square-law converter, a recently developed high-contrast spatial light modulator, may be removed. This technique uses the translation of an amplitude grating incoherently imaged upon a photorefractive crystal to obtain a moving intensity pattern within the material. We thus obtain running-wave effects similar to those seen by previous investigators writing photorefractive gratings by using the interference of two coherent frequency-shifted beams. We show both theoretically and experimentally that the criteria for removing temporal oscillations simultaneously yields a significant improvement in the diffractionefficiency of the square-law converter.
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title Stable photorefractive square-law conversion using moving grating techniques
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