Degenerate four-wave mixing and phase conjugation of pulsed CO2 laser radiation on transient gratings inside its own inverted medium

L. A. Afanas'ev; Andrei A. Ionin; Andrei A. Kotkov; Leonid V. Seleznev; Michail G. Galushkin; K. V. Mitin

doi:10.1117/12.236898

29 March 1996 Degenerate four-wave mixing and phase conjugation of pulsed CO2 laser radiation on transient gratings inside its own inverted medium

L. A. Afanas'ev, Andrei A. Ionin, Andrei A. Kotkov, Leonid V. Seleznev, Michail G. Galushkin, K. V. Mitin

Author Affiliations +

Proceedings Volume 2702, Gas and Chemical Lasers; (1996) https://doi.org/10.1117/12.236898
Event: Photonics West '96, 1996, San Jose, CA, United States

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, t_in 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.

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L. A. Afanas'ev, Andrei A. Ionin, Andrei A. Kotkov, Leonid V. Seleznev, Michail G. Galushkin, and K. V. Mitin "Degenerate four-wave mixing and phase conjugation of pulsed CO2 laser radiation on transient gratings inside its own inverted medium", Proc. SPIE 2702, Gas and Chemical Lasers, (29 March 1996); https://doi.org/10.1117/12.236898

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KEYWORDS

Pulsed laser operation

Signal processing

Reflectivity

Carbon dioxide lasers

Phase conjugation

Four wave mixing

Gas lasers

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