Development Of Third Harmonic Generation As A Short Pulse Probe Of Shock Heated Material




Grigsby, W.
Cho, B. I.
Bernstein, A. C.
Quevedo, H. J.
Colvin, J.
Downer, M. C.
Ditmire, T.

Journal Title

Journal ISSN

Volume Title



We are studying high-pressure laser produced shock waves in silicon (100). To examine the material dynamics, we are performing pump-probe style experiments utilizing 600 ps and 40 fs laser pulses from a Ti:sapphire laser. Two-dimensional interferometry reveals information about the shock breakout, while third harmonic light generated at the rear surface is used to infer the crystalline state of the material as a function of time. Sustained third harmonic generation (THG) during a similar to 100 kbar shock breakout indicate that the rear surface remains crystalline for at least 3 ns. However, a decrease in THG during a similar to 300 kbar shock breakout suggests a different behavior, which could include a change in crystalline structure.


LCSH Subject Headings


W. Grigsby, B. I. Cho, A. C. Bernstein, H. J. Quevedo, J. Colvin, M. C. Downer, and T. Ditmire. AIP Conference Proceedings 955, 1097 (Dec., 2007); doi: 10.1063/1.2832908