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:10.1117/12.248607

26 August 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 2788, High-Power Lasers: Gas and Solid State Lasers; (1996) https://doi.org/10.1117/12.248607
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

Degenerate four-wave mixing (DFWM) and phase conjugation (PC) of pulsed carbon-dioxide 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 carbon-dioxide laser has been chosen in such a way (CO₂:N₂:He equals 1:2:4, p equals 0.28 atm, t_in equals 30 microseconds) that the laser pulse length (tau_out approximately 10 - 20 microseconds) is comparable with an effective relaxation time of the upper laser level (tau_rel approximately 15 - 30 microseconds). The time-history of the carbon-dioxide 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 carbon-dioxide 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 2788, High-Power Lasers: Gas and Solid State Lasers, (26 August 1996); https://doi.org/10.1117/12.248607

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KEYWORDS

Gas lasers

Signal processing

Pulsed laser operation

Reflectivity

Phase conjugation

Mirrors

Polarization

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