Title :
Phase conjugation of CO/sub 2/ laser radiation in a medium with thermal nonlinearity
Author :
Bespalov, V.I. ; Betin, A.A. ; Zhukov, E.A. ; Mitropol´sky, O.V. ; Rusov, N. Yu
Author_Institution :
Inst. of Appl. Phys., Acad. of Sci., Gorky, USSR
fDate :
3/1/1989 12:00:00 AM
Abstract :
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.<>
Keywords :
laser beams; optical phase conjugation; organic compounds; CO/sub 2/ laser radiation; CW radiation; energy characteristics; four-wave mixing; phase conjugation; polarization characteristics; pulsed radiation; self-pumped phase-conjugate mirror; spatial characteristics; spectral characteristics; temporal characteristics; tetrachloromethane; thermal nonlinearity; Four-wave mixing; Gas lasers; Gases; Laser feedback; Liquid crystals; Mirrors; Pump lasers; Radiofrequency interference; Reflectivity; Semiconductor lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
