| 锗薄片内飞秒光偏转波谱技术 |
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| 引用本文： | 潘新宇,N.V.Chigarev,龚旗煌.锗薄片内飞秒光偏转波谱技术[J].中国物理 B,2005,14(1):212-217. |
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| 作者姓名： | 潘新宇 N.V.Chigarev 龚旗煌 |
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| 作者单位： | State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University, Beijing,100871, China;State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University, Beijing,100871, China;State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University, Beijing,100871, China |
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| 基金项目： | Project supported by the State Key Basic Research Special Foundation of China (Grant No TG1999075209), the National Natural Science Foundation of China ( Grant Nos 90206003,60378012, 10328407 and 90101027). The project was also supported by the Scientific Research Foundation for Returned Overseas Chinese Scholars, Ministry of Education, China. |
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| 摘 要： | 本文报道一种高灵敏飞秒时间分辨光偏转波谱技术。利用这一技术我们探测到锗薄片内超快的声子激发并精确测量了声脉冲的波形。我们观测到了光激发的电子—空穴等离子的超声传播。从实验数据我们推算出等离子的传播速度是锗内纵向声速的4倍。
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| 关 键 词： | 超快声脉冲，飞秒激光、光偏转技术 |
| 收稿时间： | 2004-04-27 |
| 修稿时间： | 9/1/2004 12:00:00 AM |
Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium |
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| Pan Xin-Yu,Chigarev N. V. and Gong Qi-Huang.Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium[J].Chinese Physics B,2005,14(1):212-217. |
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| Authors: | Pan Xin-Yu Chigarev N V and Gong Qi-Huang |
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| Institution: | State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University, Beijing,100871, China |
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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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| Keywords: | ultrashort acoustic pulse femtosecond laser pulse photodeflection technique |
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