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Optical Engineering

Very thick holographic nonspatial filtering of laser beams
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Paper Abstract

A novel device, the nonspatial filter, is described for laser beam cleanup. It 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 material and 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, and because they are generally too thin. New technologies that eliminate the problem of differential shrinkage are described. These technologies are based either on the use of a rigid porous substrate material, such as porous glass, filled with a light-sensitive material, such as holographic photopolymers or dichromated gelatin, or on the use of a thick photopolymer with diffusion amplification (PDA). We report results of holographic nonspatial filtering of a laser beam in one dimension, with an angular selectivity of better than 1 mrad

Paper Details

Date Published: 1 June 1997
PDF: 6 pages
Opt. Eng. 36(6) doi: 10.1117/1.601365
Published in: Optical Engineering Volume 36, Issue 6
Show Author Affiliations
Jacques E. Ludman, Northeast Photosciences, Inc. (United States)
Juanita R. Riccobono, Northeast Photosciences, Inc. (United States)
Nadya O. Reingand, Machinery Sciences Institute (United States)
Irina V. Semenova, A.F. Ioffe Physical-Technical Institute (Russia)
Yuri L. Korzinin, S.I. Vavilov State Optical Institute (Russia)
M. Selim Shahriar, Massachusetts Institute of Technology (United States)
H. John Caulfield, Alabama A&M Univ. (United States)
Jean-Marc R. Fournier, Rowland Institute (United States)
Philip L. Hemmer, Air Force Rome Lab. (United States)

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