Abstract
Shadowgraph techniques, using a Q-switched ruby laser as a light source, have been used to examine the shock waves produced in air and in water by focusing CO2 TEA laser radiation at an air–water interface. It is found that the shock speed in water decays to the sound speed within 0.5 μsec, while the shock speed in air persists at values higher than the sound speed for times long compared to 0.5 μsec.
© 1974 Optical Society of America
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