Articles

Very thick holographic nonspatial filtering of laser beams

[+] Author Affiliations
Jacques E. Ludman, Juanita R. Riccobono

Northeast Photosciences, Inc., 18 Flagg Rd., Hollis, New Hampshire 03049

Nadya O. Reinhand

Machinery Sciences Institute, V.O. Bolshay, pr. 61, St. Petersburg, Russia 199178

Irina V. Semenova

A.F. Ioffe Physical Technical Institute, Polytechnicheskaya ul. 26, St. Petersburg, Russia 194021

Yuri L. Korzinin

S.I. Vavilov State Optical Institute, St. Petersburg, Russia 199174

Selim M. Shahriar

Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

H. John Caulfield

Fisk University, Department of Physics, Nashville, Tennessee 37208

Jean-Marc Fournier

Rowland Institute, 100 Edwin Lan Blvd., Cambridge, Massachusetts 02142

Philip Hemmer

Rome Laboratory, RL/EROP, 63 Scott Road, Hanscom Air Force Base, Massachusetts 01731

Opt. Eng. 36(6), 1700-1705 (Jun 01, 1997). doi:10.1117/1.601365
History: Received Jan. 13, 1997; Accepted Jan. 14, 1997
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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. © 1997 Society of Photo-Optical Instrumentation Engineers.

© 1997 Society of Photo-Optical Instrumentation Engineers

Topics

Holography ; Lasers

Citation

Jacques E. Ludman ; Juanita R. Riccobono ; Nadya O. Reinhand ; Irina V. Semenova ; Yuri L. Korzinin, et al.
"Very thick holographic nonspatial filtering of laser beams", Opt. Eng. 36(6), 1700-1705 (Jun 01, 1997). ; http://dx.doi.org/10.1117/1.601365


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