Shock Tube Simulation of Pulsed Flow Aerodynamic Windows,
TRW DEFENSE AND SPACE SYSTEMS GROUP REDONDO BEACH CA
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Aerodynamic windows provide pressure and gas species isolation interfaces which are transparent to laser radiation. The feasibility of using a shock tube flow field as a single-shot window for short, high-energy laser pulses was investigated. A primary laser driven inertial confinement fusion test facility currently planned by DoE. Experiments were performed to determine the phase aberrations and beam-quality degradations produced by a pulsed-flow window. Holographic interferograms, when interpreted with a densitometer, typically showed an RMS phase aberration of 0.13, rad in tests using He and 1.25 in tests using air, all at the 0.694 micron Ruby wavelength.