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

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5 Author(s)
Bespalov, V.I. ; Inst. of Appl. Phys., Acad. of Sci., Gorky, USSR ; Betin, A.A. ; Zhukov, E.A. ; Mitropol'sky, O.V.
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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.<>

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 3 )

Date of Publication:

March 1989

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