Fabrication of binary phase diffusers for space-variant processing

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Title: Fabrication of binary phase diffusers for space-variant processing
Author: Chase, Scott B
Abstract: Techniques have previously been described for holographically representing space -variant systems . By spatially sampling the input plane and using phase mask diffusers to encode the multiple reference beams , one can sequentially record holograms exhibiting a minimal amount of crosstalk . Gold -coded binary phase masks have been shown to have good correlation properties with known cross -correlation bounds . This thesis describes a technique which generates phase masks using a laser scanner computer generated hologram (CGH ) writing f a c i l i t y at a wavelength of 4579A . Methods for determining the proper resist thickness to achieve the necessary 180 degree phase shift between adjacent cells in a mask include analyzing the data taken by an interference microscope and quantitative analysis of the dc component present in the Fourier spectrum of the mask . Comparisons of the effectiveness of the phase masks with that of ground -glass were obtained using two different tests . First , the phase masks were used in a space -variant processor , and the results of the multiplexed holograms were compared to those obtained earlier using a ground -glass diff user . Secondly , computer -generated holograms were made using the phase masks as diffusers and the results were compared with those previously obtained using amplitude masks .
URI: http : / /hdl .handle .net /2346 /13819
Date: 1983-12

Citation

Fabrication of binary phase diffusers for space-variant processing. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /13819 .

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