Inverse acoustooptic problem: Coherent summing of optical beams into a single optical channel

A highly efficient summing of mutually coherent beams (channels) into a single beam with the same divergence and aperture (an inverse acoustooptic problem) is realized via diffraction in a Bragg cell. The multibeam field to be converged is formed as a result of the diffraction (splitting) of a singl...

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Bibliographic Details
Published in:Technical physics 2007-05, Vol.52 (5), p.610-615
Main Authors: Antonov, S. N., Vainer, A. V., Proklov, V. V., Rezvov, Yu. G.
Format: Article
Language:English
Subjects:
Acousto-optics
Bragg cells
Diffraction
Efficiency
Laser beams
Radiation
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Summary:A highly efficient summing of mutually coherent beams (channels) into a single beam with the same divergence and aperture (an inverse acoustooptic problem) is realized via diffraction in a Bragg cell. The multibeam field to be converged is formed as a result of the diffraction (splitting) of a single laser beam. Theoretical and experimental evidence is obtained for the fact that the repeated diffraction can provide a highly efficient (up to 100%) reconstruction of beam with initial parameters. The experiments are performed with a single-mode laser radiation at 0.63 μm and multimode radiation at 0.96 μm. The virtually attained summing efficiency is on the order of 70%. The factors that act to diminish the experimental efficiency below the predicted value, the ways to raise the efficiency, and possible applications of the results of this study are discussed.
ISSN:1063-7842
1090-6525
DOI:10.1134/S106378420705012X