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Proceedings Paper

Low-Pressure Iodine Laser: Effect Of Collisional Relaxation Of Velocity Distribution On Efficiency And Longitudinal Mode Spectrum
Author(s): Alan H. Paxton; William P. Latham Jr.
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Paper Abstract

Doppler-broadened gas lasers can be influenced by the process of the relaxation of the velocity distribution of the lasing species due to elastic collisions. The homogeneous line width is increased to account for the broadening of the atomic resonance due to the collisional phase shift of the radiation, in the simplest treatment of this process. When a treatment of velocity redistribution due to elastic collisions must also be included, the collision-time-approximation to the transport integral equation is commonly used. The iodine laser that will be discussed here uses helium as a buffer gas, so the iodine atoms collide with helium atoms far more frequently than with any other molecule. The ratio of masses for these two atoms is so large that the collision-time-approximation may not be valid. Here we describe a rate-equation model for the oxygen-iodine laser that incorporates the Fokker-Planck equation for the redistribution of the iodine velocities. This numerical model is used to calculate the spectrum of longitudinal modes and the variation of laser efficiency with length.

Paper Details

Date Published: 31 May 1989
PDF: 11 pages
Proc. SPIE 1045, Modeling and Simulation of Laser Systems, (31 May 1989); doi: 10.1117/12.951321
Show Author Affiliations
Alan H. Paxton, Mission Research Corporation (United States)
William P. Latham Jr., Air Force Weapons Laboratory/AR3 (United States)

Published in SPIE Proceedings Vol. 1045:
Modeling and Simulation of Laser Systems
Donald L. Bullock, Editor(s)

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