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1 December 1991 Pulsed holographic recording of very high speed transient events
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New techniques for high speed holography are being developed for use in the investigation of transient events with lifetimes between 10 and 500 nanoseconds. Typically, multiple Q-switching of a pulsed laser allows optical pulse separations no shorter than 10 microseconds. To study crack propagation in brittle materials and shock wave propagation in air, optical pulses with temporal separations less than 1 microsecond are required. By employing a beam profile preserving optical delay line, pulse separations ranging from 25 to 450 nanoseconds have been generated. Using this technique, shock waves travelling at Mach 20 have been recorded, and crack propagation through glass has been studied. In order to investigate crack propagation through brittle 100 micron thick films, sub-nanosecond holographic techniques are being developed using gated pulses from a mode-locked Nd:YAG laser.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Scott Steckenrider, Michael J. Ehrlich, and James W. Wagner "Pulsed holographic recording of very high speed transient events", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);

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