15 February 1993 High-speed holographic 'cinematography' with frame rates approaching 25 nanoseconds
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Abstract
A holographic recording system has been developed in which a single pulse from a frequency doubled Nd:YAG laser is repeatedly split and delayed to provide up to 10 pulses which are separated both in time and in space. A custom graded beam splitter is used to help insure near equal amplitude of all ten pulses. A White cell provides adjustable delay between the sequential outputs of the system over a range from 28 to 170 nanoseconds. By appropriate design of the holographic recording geometry, up to ten distinct holographic frames may be recorded in sequence on a single 4' X 5' film plate. Using the system, studies have been performed on the dynamics of detonation of 100 micron explosive particles and on the acceleration and growth of cracks in brittle materials. CW reconstruction of each holographic frame permits microscopic examination of the reconstructed image so that precise measurements of shock front or crack length may be made as a function of time.
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Michael J. Ehrlich, Michael J. Ehrlich, J. Scott Steckenrider, J. Scott Steckenrider, James W. Wagner, James W. Wagner, "High-speed holographic 'cinematography' with frame rates approaching 25 nanoseconds", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140807; https://doi.org/10.1117/12.140807
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