Two-dimensional source flow gain model for the chemical oxygen-iodine laser

Drew A. Copeland; Tientsai T. Yang

doi:10.1117/12.273661

2 May 1997 Two-dimensional source flow gain model for the chemical oxygen-iodine laser

Drew A. Copeland, Tientsai T. Yang

Proceedings Volume 2989, Modeling and Simulation of Higher-Power Laser Systems IV; (1997) https://doi.org/10.1117/12.273661
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

A source flow gain model for optical extraction from the chemical oxygen-iodine laser medium is presented. In this model the gas dynamics of the reactive flow through the optical cavity, transverse to the optical axis, is described by the two-dimensional boundary-layer approximation to the full Navier-Stokes equations. The appropriate mass continuity, species, momentum, and energy conservation equations in cylindrical polar coordinates are presented and discussed. The gas kinetics are described by a reduced set of fourteen reactions among nine chemical species and includes pumping of the upper laser level by O₂(¹(Delta) ), deactivation by water and energy pooling with O₂(¹(Delta) ), and the Heidner molecular I₂ dissociation mechanism. Stimulated emission on the 3 YLD 4 hyperfine transition of atomic iodine is described by a generalized version of the Zagidullian gain model which includes finite hyperfine relaxation of the ²P_1/2 and ²P_3/2 iodine sublevels, velocity cross-relaxation of the iodine atoms, and allows for incomplete I₂ dissociation. The model is illustrated by application to a laboratory-sized device and the effects of the boundary layer upon the gas flow, I₂ dissociation, O₂(¹(Delta) ) fraction, small signal gain, optical extraction, and the medium homogeneity are examined.

Citation Download Citation

Drew A. Copeland and Tientsai T. Yang "Two-dimensional source flow gain model for the chemical oxygen-iodine laser", Proc. SPIE 2989, Modeling and Simulation of Higher-Power Laser Systems IV, (2 May 1997); https://doi.org/10.1117/12.273661

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