Exciplex lasers operate at visible and near ultraviolet wavelengths and the medium homogeneity requirement to produce a near diffraction-limited beam from such a laser is suite stringent: (δρ/ρ) rms-5x10-5. This study addresses flow and acoustic issues involved in achieving good beam quality from a rep-pulsed system. A specially designed blowdown facility was used to demonstrate experimentally that the required level of baseline flow homogeneity could be achieved. Theoretical models were developed to understand the performance of an acoustic attenuation system involving sidewall mufflers placed immediately upstream and downstream of the laser cavity. The flow clearing process after single and multiple pulses with such mufflers has been studied in the blowdown facility using movie interferometry.