Intracavity phase conjugation in active medium of frequency selective pulsed CO laser

Abstract

Energetic, temporal and spectral characteristics of the phase conjugation (PC) process at intracavity degenerate four wave mixing (DFWM) of frequency selective pulsed ebeam controlled discharge (EBCD) CO laser radiation are studied both experimentally and theoretically. Laser gas mixture CO:N2:He=1:4:5, gas density 0.3 Amagat, gas temperature 120-140 K, interaction angle ~10 mrad at DFWM without optical delay between probe wave E3 and co-propagating pumping one E1, active medium length 1.2 m, laser resonator length 17.7 m. PC reflectivity (PCR) on energy was ~1%, being independent of specific input energy. The dependencies of PCR on pressure had quite different behavior for different selected spectral lines. An influence of the neighboring vibrational band lasing on PCR for the spectral line under the investigation is demonstrated (Tab.l), PCR decreasing at switching on neighboring line lasing.