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Chinese Physics, 2005, Vol. 14(1): 212-217    DOI: 10.1088/1009-1963/14/1/039
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium

Pan Xin-Yu (潘新宇), Chigarev N. V., Gong Qi-Huang (龚旗煌)
State Key Laboratory for Mesoscopic Physics and Department of Physics,Peking University, Beijing 100871, China
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.
Keywords:  ultrashort acoustic pulse      femtosecond laser pulse      photodeflection technique  
Received:  27 April 2004      Revised:  01 September 2004      Accepted manuscript online: 
PACS:  7847  
  4280W  
  4335  
  6860  
  6320  
Fund: 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

Cite this article: 

Pan Xin-Yu (潘新宇), Chigarev N. V., Gong Qi-Huang (龚旗煌) Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium 2005 Chinese Physics 14 212

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