Phase conjugation of CO/sub 2/ laser radiation in a medium with thermal nonlinearity

An investigation of reflectivity and quality of phase conjugation of CO/sub 2/ laser radiation by four-wave mixing in a medium with thermal nonlinearity is discussed. High reflectivity produced by four-wave mixing in CCl/sub 4/ was demonstrated both for pulsed radiation (180%) and for CW radiation (...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1989-03, Vol.25 (3), p.360-367
Main Authors: Bespalov, V.I., Betin, A.A., Zhukov, E.A., Mitropol'sky, O.V., Rusov, N.Y.
Format: Article
Language:English
Subjects:
Four-wave mixing
Gas lasers
Gases
Laser feedback
Liquid crystals
Mirrors
Pump lasers
Radiofrequency interference
Reflectivity
Semiconductor lasers
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Summary:An investigation of reflectivity and quality of phase conjugation of CO/sub 2/ laser radiation by four-wave mixing in a medium with thermal nonlinearity is discussed. High reflectivity produced by four-wave mixing in CCl/sub 4/ was demonstrated both for pulsed radiation (180%) and for CW radiation (20%). A self-pumped phase-conjugate mirror based on four-wave mixing with feedback was realized. Energy, spatial, spectral, temporal, and polarization characteristics of radiation generated by four-wave mixing with feedback in CCl/sub 4/ were investigated. The minimum threshold energy of the input signal was approximately=8 mJ; the maximum energy reflectivity was about 5. The spatial structure of radiation generated in the scheme of four-wave mixing with feedback was investigated theoretically, and the conditions for phase conjugation, both for regular and for speckled signal beams, were determined.< >
ISSN:0018-9197
1558-1713
DOI:10.1109/3.18550