Probing impulsive strain propagation with X-ray pulses |
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Authors: | Reis D A DeCamp M F Bucksbaum P H Clarke R Dufresne E Hertlein M Merlin R Falcone R Kapteyn H Murnane M M Larsson J Missalla T Wark J S |
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Institution: | Departement of Physics, University of Michigan, Ann Arbor 48109-1120, USA. |
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Abstract: | Pump-probe time-resolved x-ray diffraction of allowed and nearly forbidden reflections in InSb is used to follow the propagation of a coherent acoustic pulse generated by ultrafast laser excitation. The surface and bulk components of the strain could be simultaneously measured due to the large x-ray penetration depth. Comparison of the experimental data with dynamical diffraction simulations suggests that the conventional model for impulsively generated strain underestimates the partitioning of energy into coherent modes. |
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