Abstract
Monitoring shock propagation through the bulk of an opaque solid has a strong impact in the study of both wave physics and warm dense matter, but requires large, high-brilliance x-ray facilities. This Letter demonstrates that such measurement can also be performed using a counterpropagating ultrasonic plane wave: As the shock modulates the medium during propagation, scattering occurs when the two waves collide. The spatial widening of a nanosecond-scale laser-driven shock wave over three round trips in metallic samples is imaged with a tabletop phase-array device. This technique could greatly facilitate the study of shock-wave phenomena.
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