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1 August 1990 Two-dimensional numerical study of wave damping in a high-average-power excimer laser
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Proceedings Volume 1278, Excimer Lasers and Applications II; (1990)
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands
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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Miloud Bessafi, Patrick Canarelli, Philippe Ch. Delaporte, Bernard L. Fontaine, Bernard M. Forestier, Marc L. Sentis, and David Zeitoun "Two-dimensional numerical study of wave damping in a high-average-power excimer laser", Proc. SPIE 1278, Excimer Lasers and Applications II, (1 August 1990);

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