Summary form only given, as follows. Parametric study of degenerate four-wave mixing and phase-conjugation (PC) of e-beam controlled discharge pulsed CO/sub 2/ and CO laser radiation in their inverted media has been carried out experimentally. The influence of the following parameters on energetic and temporal characteristics of PC signal and reflectivity has been studied: input energy (50-300 J/l.Amagat), small signal gain (0.5-2.0 2.0 m/sup -1/) laser mixture contents (CO/sub 2/:N/sub 2/:He=1:2:7 with high He contents, 1:5:3 with high nitrogen contents; CO:N/sub 2/:He=1:4:5), gas pressure (density) (0.1-0.56 atm for CO/sub 2/, 0.3 Amagat for CO), reflectivity of output mirror (7.5-65%), single line and multiline laser spectrum (10.6 /spl mu/m P(20); 9.6 /spl mu/m P(22), P(24) for CO/sub 2/; 5.3-5.6 /spl mu/m and 5.39 /spl mu/m P/sub 10.9/(14) for CO), probe and pumping waves intensity (intensity ratio is 0.02-5.0), geometry (the angle between the probe and pumping wave is 10-40 mrad), coherent parameters (optical delay and polarisation). The maximum PC reflectivity does not exceed 2% for CO/sub 2/ and 0.2% for CO lasers. The complicated time-history of the PC signal for pulsed CO/sub 2/ and CO lasers reflects the main relaxation processes taking place in the inverted medium and demonstrates the relative role of the two main mechanisms-saturated gain (amplitude) and thermal (phase) ones-which are responsible for formation of transient diffraction gratings in the active medium of CO/sub 2/ and CO lasers. The influence of the Q-factor and the intensity ratio of probe and pumping waves on optical quality of the PC signal has been also investigated.
Parametric study of degenerate four-wave mixing and phase conjugation of CO/sub 2/ and CO lasers radiation in their inverted medium
1996-01-01
67589 byte
Conference paper
Electronic Resource
English
British Library Conference Proceedings | 1996
|British Library Conference Proceedings | 1996
|British Library Conference Proceedings | 1996
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