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Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium
锗薄片内飞秒光偏转波谱技术

Keywords: ultrashort acoustic pulse,femtosecond laser pulse,photodeflection technique
超快声脉冲,飞秒激光、光偏转技术

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Abstract:

A highly sensitive photodeflection spectroscopy technique with femtosecond time resolution has been developed. Using this technique, we have measured accurately the shape of acoustic pulses, which were generated from the ultrafast phonon emission in a germanium plate. Supersonic expansion of photoexcited electron-hole plasma was observed. The characteristic velocity of plasma diffusion was evaluated. It exceeded the longitudinal sound velocity in germanium by a factor of 4.0.

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