Abstract: The results of experiments on four-wave interaction of electron-beam-controlled discharge long pulsed CO$-2$/-lasers' (t-20 $mu@s) and CO- lasers' (t approximately 200 $mu@s) radiation inside their active medium are presented. Linearly polarized probe CO$-2$/ (CO-) laser beam intersects strong electromagnetic waves counterpropagating through an inverted medium inside the laser resonator. The laser beam reflected from the active medium has been registered both in near-field zone and in far field one. The experiments on recovering of optical images in near-field zone and recovering of angular divergency of laser radiation in far-field zone demonstrated that reflected beam was phase-conjugated one. The reflectivity of phase-conjugated beam was up to 2% for CO$-2$/-laser and up to 0.2% for CO- laser. The time-history of phase-conjugation reflectivity and comparison with theoretical results are discussed.!7
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