Abstract
Coupled simulation based on intracavity partially coherent light model and 3D CFD model is firstly achieved in this paper. The dynamic equation of partially coherent intracavity field is derived based on partially coherent light theory. A numerical scheme for the coupled simulation as well as a method for computing the intracavity partially coherent field is given. The presented model explains the formation of the sugar scooping phenomenon, and enables studies on the dependence of the spatial mode spectrum on physical parameters of laser cavity and gain medium. Computational results show that as the flow rate of iodine increases, higher order mode components dominate in the partially coherent field. Results obtained by the proposed model are in good agreement with experimental results.
Highlights
The operational mechanism of gas chemical lasers, e.g. chemical oxygen iodine lasers (COIL) involves the entangled processes of optical oscillation, fluid mixing and chemical reactions [1]
3D computational fluid dynamic (CFD) studies based on the Navier-Stokes equation were carried out for analyzing the mixing process of the molecular iodine and the excited state molecular oxygen [4,5]
A coupled simulation of the intracavity partially coherent light model and the 3D CFD model of the chemical reacting flowing lasing media is realized for the first time
Summary
The operational mechanism of gas chemical lasers, e.g. chemical oxygen iodine lasers (COIL) involves the entangled processes of optical oscillation, fluid mixing and chemical reactions [1]. To get a better understanding of these processes and improve the laser design, reliable models have to be built. Studies included only a 1D flowing process, a few chemical reactions that directly related to pumping and lasing, and simplified Fabry-Perot cavity [2,3]. 3D computational fluid dynamic (CFD) studies based on the Navier-Stokes equation were carried out for analyzing the mixing process of the molecular iodine and the excited state molecular oxygen [4,5]. While the near/far field intensity profile and beam quality are of interest, optical computation is needed to be associated with fluid dynamic and chemical kinetic computations [8]
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