Share Email Print

Proceedings Paper

Two-dimensional numerical study of wave damping in a high-average-power excimer laser
Author(s): Miloud Bessafi; Patrick Canarelli; Philippe Ch. Delaporte; Bernard L. Fontaine; Bernard M. Forestier; Marc L. Sentis; David Zeitoun
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

To obtain a high average laser output power and a good quality laser beam in high repetition rate excimer lasers, it is necessary to swept the heated gas out of the laser cavity between two electrical excitations and to damp density fluctuations induced by acoustic and shock waves. In this aim, a numerical study of an unsteady two-dimensional flow inside the laser head has been undertaken at I.M.F.M. This study is extended to the case when mufflers are added in the surroundings of discharge zone. The work is achieved by means of a numerical model based on a finite difference scheme with a flux corrected transport algorithm (Shasta. F.C.T. method). This method allows to simulate the propagation of longitudinal (along the flow) and transversal (between the electrodes) shock waves induced by the active medium excitation, and the effects of acoustic dampers on the density fluctuations. Transversal acoustic waves are induced by the non-uniformity of energy deposited between the electrodes. The model uses two dimensional Euler equations in the laser flow channel and one dimensional Euler equations in the acoustic damper (grid and porous material). Several comparisons between experimental and numerical results have been performed to establish the model validity. The influence of the acoustic dampers on the transversal wave decay process in a laser cavity is presented.

Paper Details

Date Published: 1 August 1990
PDF: 12 pages
Proc. SPIE 1278, Excimer Lasers and Applications II, (1 August 1990); doi: 10.1117/12.20612
Show Author Affiliations
Miloud Bessafi, Institut de Mecanique des Fluides de Marseille (France)
Patrick Canarelli, Institut de Mecaniquie des Flu (France)
Philippe Ch. Delaporte, Institute de Mecanique des Flu (France)
Bernard L. Fontaine, Institut de Mecanique des Flui (France)
Bernard M. Forestier, Aix-Marseille Univ. (France)
Marc L. Sentis, Institut de Mecanique des Flui (France)
David Zeitoun, Univ. de Provence (France)

Published in SPIE Proceedings Vol. 1278:
Excimer Lasers and Applications II
Tommaso Letardi, Editor(s)

© SPIE. Terms of Use
Back to Top