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Journal of Optical Technology

Phase conjugation based on the self-action of radiation in the active medium of a CO 2 laser

Alexander A. Ageichik, Oleg G. Kotyaev, Yu. A. Rezunkov, Alexander L. Safronov, Vladimir V. Stepanov

Published Jun 1, 1997• 0 citations
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•Jan 1, 1991•0 citations
An experimental study of a four-wave interaction in the active laser medium was made for long (10–10 3 μs) pulses emitted by electron-beam-controlled-discharge CO 2 and CO lasers. Linearly polarised probe radiation from a CO 2 (CO) laser was directed into the intracavity inverted medium of the laser itself. The radiation reflected back by the active medium was recorded in the near-field and far-field zones. Phase conjugation was confirmed by reconstruction of the spatial pattern of the radiation field in the near-field zone and of the angular divergence of the radiation in the far-field zone. The energy coefficient representing phase conjugation by reflection reached 2% for the CO 2 laser and 0.2% for the CO laser. The time dependence of the phase-conjugation power coefficient was analysed.
The results of experiments on four-wave interaction of electron-beam-controlled discharge (EBCD) pulsed CO2- and CO- lasers' radiation inside their active medium are presented. Linearly polarized probe CO2 (CO-) laser beam intersects strong electromagnetic waves counterpropagating through an inverted medium inside the laser resonator. The laser beam reflected from the active medium has been registered both in near-field zone and in far field. The experiments on recovering of optical images in near-field zone and recovering of angular divergency of laser radiation in far-field zone demonstrate that the reflected beam was a phase- conjugated one. The reflectivity of the phase-conjugated beam was up to 2% for CO2- laser and up to 0.2% for CO- laser. The time-history of phase-conjugation reflectivity and comparison with theoretical results are discussed.