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Proceedings Paper

Porous-matrix holography for nonspatial filtering of lasers
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Paper Abstract

A novel technique is described for laser beam cleanup, the nonspatial filter, which is based on the Bragg selectivity of thick holograms. Unlike pinhole and fiber spatial filters, which employ lenses and apertures in the transform plane, nonspatial filters operate directly on the laser beam. This eliminates the need for laser beam focusing, which is the source of many of the alignment instabilities and laser power limitations of spatial filters. Standard holographic materials are not suitable for this application because differential shrinkage during processing limits the maximum Bragg angle selectivity attainable. This paper describes a new technology which eliminates the problem of differential shrinkage. This technology is based on the use of a rigid porous substrate material, such as porous gas, filled with a light sensitive material, such as holographic photopolymers or dichromated gelatin. We report preliminary results of holographic nonspatial filtering of a laser beam in one dimension, with an angular selectivity of less than 1 milliradian.

Paper Details

Date Published: 12 April 1995
PDF: 10 pages
Proc. SPIE 2406, Practical Holography IX, (12 April 1995); doi: 10.1117/12.206205
Show Author Affiliations
Jacques E. Ludman, Northeast Photosciences, Inc. (United States)
Juanita R. Riccobono, Northeast Photosciences, Inc. (United States)
H. John Caulfield, Alabama A&M Univ. (United States)
Jean-Marc R. Fournier, Rowland Institute for Science (United States)
Irina V. Semenova, A.F. Ioffe Physical-Technical Institute (Russia)
Nadya O. Reingand, Machinery Sciences Institute (United States)
Philip L. Hemmer, Rome Lab. (United States)
M. Selim Shahriar, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2406:
Practical Holography IX
Stephen A. Benton, Editor(s)

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