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Proceedings Paper

Effect of velocity cross-relaxation and mode separation upon the power spectrum of a chemical oxygen-iodine laser resonator
Author(s): Drew A. Copeland
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Paper Abstract

A gain model for optical extraction from the CW chemical oxygen-iodine laser medium is described. It uses a simplified, temperatuire-dependent, chemical kinetics package which consists of several reactions between molecular oxygen, atomic and molecular iodine, water, and helium. The Heidner I2 dissociation mechanism is included to allow for incomplete dissociation. Gas flow is treated using a premixed, one-dimensional stream-tube model which accounts for gas expansion and heat release in the cavity. Collisional cross-relaxation effects upon the Doppler-broadened line are treated using a Fokker-Planck diffusion model of the velocity distribution of the upper and lower laser levels. This model, in conjunction with geometric optics, multimode model of an unstable standing-wave confocal resonator, is used to examine the influence of incomplete velocity cross-relaxation and longitudinal mode separation upon the output power and mode spectrum of the laser. It is shown that lasing will occur on all available modes even when the mode separation is less than the collision linewidth.

Paper Details

Date Published: 1 June 1990
PDF: 27 pages
Proc. SPIE 1224, Optical Resonators, (1 June 1990); doi: 10.1117/12.18463
Show Author Affiliations
Drew A. Copeland, Rockwell International Corp. (United States)

Published in SPIE Proceedings Vol. 1224:
Optical Resonators
Dale A. Holmes, Editor(s)

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