Share Email Print
cover

Proceedings Paper

Degenerate four-wave mixing and phase conjugation of pulsed CO2 laser radiation on transient gratings inside its own inverted medium
Author(s): L. A. Afanas'ev; Andrei A. Ionin; Andrei A. Kotkov; Leonid V. Seleznev; Michail G. Galushkin; K. V. Mitin
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Degenerate four-wave mixing (DFWM) and phase conjugation (PC) of pulsed CO2 laser radiation on transient gratings inside its own laser medium have been studied both experimentally and theoretically. The operational mode of the e-beam controlled discharge CO2 laser has been chosen in such a way (CO2:N2:He equals 1:2:4, p equals 0.28 atm, tin equals 30 microsecond(s) ) that the laser pulse length ((tau) out approximately 10 - 20 microsecond(s) ) is comparable with an effective relaxation time of the upper laser level ((tau) rel approximately 15 - 30 microsecond(s) ). The time-history of the CO2 laser and PC signal pulses, and PC reflectivity have been thoroughly investigated for different cavity Q factors and specific electrical energy inputs. It has been shown, that the formation of the PC signal under the intracavity DFWM on gain (amplitude) and thermal (phase) gratings is characterized by a complicated time history that reflects the main relaxation processes taking place inside the inverted medium. A feature of the transient PC process inside the laser active medium is the dependence of the effective relaxation time of the upper laser level on the intensity of pumping waves. PC reflectivity has been obtained by numerical calculations. A comparison of the theoretical and experimental data confirms the contribution of two different mechanisms of grating formation under DFWM inside the active medium of the CO2 laser.

Paper Details

Date Published: 29 March 1996
PDF: 9 pages
Proc. SPIE 2702, Gas and Chemical Lasers, (29 March 1996); doi: 10.1117/12.236898
Show Author Affiliations
L. A. Afanas'ev, P.N. Lebedev Physics Institute (Russia)
Andrei A. Ionin, P.N. Lebedev Physics Institute (Russia)
Andrei A. Kotkov, P.N. Lebedev Physics Institute (Russia)
Leonid V. Seleznev, P.N. Lebedev Physics Institute (Russia)
Michail G. Galushkin, Scientific Research Ctr. for Technological Lasers (Russia)
K. V. Mitin, NPO Astrophysika (Russia)


Published in SPIE Proceedings Vol. 2702:
Gas and Chemical Lasers
Robert C. Sze, Editor(s)

© SPIE. Terms of Use
Back to Top