%0 Journal Article
%T Femtosecond photodeflection spectroscopy in thin monocrystalline plates of germanium<br>锗薄片内飞秒光偏转波谱技术
%A Pan Xin-Yu
%A Chigarev N V
%A Gong Qi-Huang
%A <br>潘新宇
%A N.V.Chigarev
%A 龚旗煌
%J 中国物理 B
%D 2005
%I 
%X 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.
%K ultrashort acoustic pulse
%K femtosecond laser pulse
%K photodeflection technique<br>超快声脉冲，飞秒激光、光偏转技术
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=0226E94524F5BC8D45CBB78F0C606060&yid=2DD7160C83D0ACED&vid=F3583C8E78166B9E&iid=CA4FD0336C81A37A&sid=D2742EEE6F4DF8FE&eid=F9F74EC1AA08A7B9&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=18