Acoustic generation in crystalline silicon with femtosecond optical pulses

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Abstract
Volume contraction in bulk silicon crystals is observed on excitation with femtosecond visible optical pulses. The surface deformation and generated acoustic strain are measured using detection based on both probe beam reflectivity changes and probe beam deflection. The contraction is explained by the dominant electronic contribution to the strain from excitation of electron‐hole pairs, which swamps the thermoelastic expansion.

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