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Proceedings Paper

Dependence of laser properties on statistical distortions of active medium
Author(s): Keming Du
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Paper Abstract

In this paper we are interested in the effects of statistical phase and gain distortions. We will present experimental results, which show the strong dependencies of the beam quality of a 13 kW CO2 laser with an unstable resonator on the gas flowing state and on the rf-excitation power. These dependencies are mainly attributed by the phase distortion (stationary and statistical) of the active medium, resulting from the gas discharge, from the turbulence of the high mass rate flow and from the interaction between the turbulence and the discharge. In order to estimate the influences of the statistical phase and gain distortions on beam quality and output power, a theoretical model has been developed, where the phase and gain distortions are simulated using two statistical phase sheets and two gain sheets, respectively, located near the both resonator mirrors. Using the model the dependencies of beam quality, the Strehl ratio and output power on the dimension and the strength of the statistical phase and gain distortions were investigated. The numerical results will be discussed.

Paper Details

Date Published: 13 August 1993
PDF: 8 pages
Proc. SPIE 1868, Laser Resonators and Coherent Optics: Modeling, Technology, and Applications, (13 August 1993); doi: 10.1117/12.150602
Show Author Affiliations
Keming Du, Fraunhofer-Institut fuer Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 1868:
Laser Resonators and Coherent Optics: Modeling, Technology, and Applications
Anup Bhowmik, Editor(s)

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