DocumentCode :
2601170
Title :
Parametric study of degenerate four-wave mixing and phase conjugation of CO2 and CO lasers radiation in their inverted medium
Author :
Ionin, A. ; Afanas´ev, L. ; Klimachev, Yu. ; Kotkov, A. ; Selemev, L. ; Sinitsyn, D.
Author_Institution :
P.N. Lebedev Phys. Inst., Acad. of Sci., Moscow, Russia
Volume :
2
fYear :
1996
fDate :
18-21 Nov 1996
Abstract :
Summary form only given, as follows. Parametric study of degenerate four-wave mixing and phase-conjugation (PC) of e-beam controlled discharge pulsed CO2 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-1) laser mixture contents (CO2:N2:He=1:2:7 with high He contents, 1:5:3 with high nitrogen contents; CO:N2:He=1:4:5), gas pressure (density) (0.1-0.56 atm for CO2, 0.3 Amagat for CO), reflectivity of output mirror (7.5-65%), single line and multiline laser spectrum (10.6 μm P(20); 9.6 μm P(22), P(24) for CO2 ; 5.3-5.6 μm and 5.39 μm P10.9(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 CO2 and 0.2% for CO lasers. The complicated time-history of the PC signal for pulsed CO2 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 CO2 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
Keywords :
Q-factor; carbon compounds; diffraction gratings; electron beam pumping; gas lasers; laser beams; multiwave mixing; optical phase conjugation; reflectivity; 0.1 to 0.56 atm; 10.6 mum; 5.3 to 5.6 mum; 5.39 mum; 9.6 mum; CO; CO laser; CO2; CO2 laser; Q-factor; active medium; coherent parameters; degenerate four-wave mixing; electron-beam controlled discharge pulsed laser; energetic characteristics; input energy; intensity ratio; inverted medium; laser radiation; optical quality; phase conjugation; probe waves; pumping waves; reflectivity; relaxation processes; saturated gain; temporal characteristics; time-history; transient diffraction gratings; Four-wave mixing; Gas lasers; Laser excitation; Optical control; Optical pulses; Optical pumping; Parametric study; Probes; Pump lasers; Reflectivity;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lasers and Electro-Optics Society Annual Meeting, 1996. LEOS 96., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-3160-5
Type :
conf
DOI :
10.1109/LEOS.1996.571976
Filename :
571976
Link To Document :
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