Miloud Bessafi,1 Patrick Canarelli,2 Philippe Ch. Delaporte,3 Bernard L. Fontaine,4 Bernard M. Forestier,5 Marc L. Sentis,4 David Zeitoun6
1Institut de Mecanique des Fluides de Marseille (France) 2Institut de Mecaniquie des Flu (France) 3Institute de Mecanique des Flu (France) 4Institut de Mecanique des Flui (France) 5Aix-Marseille Univ. (France) 6Univ. de Provence (France)
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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.
Miloud Bessafi,Patrick Canarelli,Philippe Ch. Delaporte,Bernard L. Fontaine,Bernard M. Forestier,Marc L. Sentis, andDavid 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); https://doi.org/10.1117/12.20612
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Miloud Bessafi, Patrick Canarelli, Philippe Ch. Delaporte, Bernard L. Fontaine, Bernard M. Forestier, Marc L. Sentis, 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); https://doi.org/10.1117/12.20612