Photoanisotropic incoherent-to-coherent conversion using five-wave mixing

Tizhi Huang; Kelvin H. Wagner

doi:10.1117/12.50769

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1 December 1991 Photoanisotropic incoherent-to-coherent conversion using five-wave mixing

Tizhi Huang, Kelvin H. Wagner

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Proceedings Volume 1562, Devices for Optical Processing; (1991) https://doi.org/10.1117/12.50769
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

In this paper we present a new approach to incoherent-to-coherent optical conversion based on a real-time five-wave mixing technique in photoanisotropic organic film. A uniform grating is holographically written in the sample, and then locally erased by an incident white light image. Subsequent coherent diffraction of the spatially modulated grating imposes the inverse of the incoherent image onto the reading laser beam, allowing subsequent coherent optical processing. A theoretical analysis of the holographic recording and erasing mechanism in these photoanisotropic materials is presented, and the saturation is shown to be responsible for the grating intermodulation that produce the incoherent-to-coherent conversion. Experimental results of white light images converted to inverted coherent images in real-time are presented, and the resolution is shown to exceed 28 lp/mm.

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Tizhi Huang and Kelvin H. Wagner "Photoanisotropic incoherent-to-coherent conversion using five-wave mixing", Proc. SPIE 1562, Devices for Optical Processing, (1 December 1991); https://doi.org/10.1117/12.50769

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