Criteria for fluid and thermal properties delineating the baseline flow homogeneity, such as those for ΔT/T, ΔP/P, Δp/p, ΔU/U will be established. These are based on medium optical characteristics and requirements in terms of wavelength, pressure, and temperature of the gas medium associate,- with visible wave-length lasers. To meet these criteria, various methods for conditioning the baseline flow from the stand-point of gas dynamic and acoustic technologies will be presented and discussed. The merits of open and closed cycles for the baseline flow will be evaluated through consideration of gas utilization efficiency and component requirements. These criteria become acoustic dominated for pulsed lasers. The pulse repetition frequency required for a given laser defines the clearing time allowed to restore the original baseline flow. A parallel consideration becomes necessary to account for the pulse input perturbation. Solutions to acoustic management problems must be obtained by considering all sources of reflection, acoustic characteristics of open and closed cycles in terms of wave propagation, attenuation, and dissipation.