Abstract

We describe a high-speed, two-frame shadowgraph method for the two-dimensional visualization of an expanding laser-induced plasma and shock wave in two time instances. The developed experimental method uses a 30ps, green-laser, polarized pulse for the direct and delayed illumination separated by a variable time delay in the range from 300ps to 30ns. Since the exposed images of a single event are captured with two CCD cameras, the established method enables velocity measurements of the fast laser-induced phenomena within the nanosecond excitation- laser pulse as well as at later times—when the excitation-laser radiation has already ended.

© 2011 Optical Society of America

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