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Proceedings Paper

Oxygen iodine laser kinetics and small signal gain
Author(s): Willy L. Bohn; Keith A. Truesdell; W. Pete Latham; Petras V. Avizonis
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Paper Abstract

A simple model for predicting the small signal gain as a function of flow direction will be presented. The small signal gain was measured on the Weapons Laboratory Rotocoil 02/I* gain medium. The characteristics observed in the experiment show a decrease in the small signal gain as a function of distance from the nozzle exit plane. Further results indicated that the small signal gain decreased with time and that the gain increased when the cold trap was turned on. All of these effects suggest a temperature dependence of the small signal gain. The approach presented in this paper is to develop a simple model which includes a simplified kinetics model and the gas dynamics for the flowing medium. An analytic solution to the model equations is also derived. These models account for the reduction in small signal gain in the flow direction due to heat release into the cavity when compared to the Rotocoil small signal gain data. The results show that the rise in gas temperature in the flowing 02/I* medium is primarily due to water deactivation of the I* and the O2(1Δ) plus I* pooling leading to water deactivation of 1Σ. Such temperature rise in the flowing medium causes the small signal gain to decay substantially in the flow direction due to the square root of the temperature dependence in the stimulated emission cross section, the shift in the equilibrium constant with temperature and the decrease in density which is inversely proportional to the temperature.

Paper Details

Date Published: 1 June 1990
PDF: 9 pages
Proc. SPIE 1225, High-Power Gas Lasers, (1 June 1990); doi: 10.1117/12.34703
Show Author Affiliations
Willy L. Bohn, Air Force Weapons Lab. (United States)
Keith A. Truesdell, Air Force Weapons Lab. (United States)
W. Pete Latham, Air Force Weapons Lab. (United States)
Petras V. Avizonis, Air Force Weapons Lab. (United States)

Published in SPIE Proceedings Vol. 1225:
High-Power Gas Lasers
Petras V. Avizonis; Charles Freed; Jin J. Kim; Frank K. Tittel, Editor(s)

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