%0 Journal Article
%T Influence of long lifetime absorption process on the measurement of ultrafast carrier dynamics<br>长寿命吸收过程对超快动力学过程测量的影响
%A Wang Wen-Fang
%A Chen Ke
%A Wu Jing-D
%A Wen Jin-Hui
%A Lai Tian-Shu
%A <br>王文芳
%A 陈科
%A 邬静达
%A 文锦辉
%A 赖天树
%J 物理学报
%D 2011
%I 
%X The wavelength dependence of ultrafast relaxation dynamics of photoexcited carriers in bulk GaAs is studied using femtosecond time-resolved pump-probe transmission spectroscopy under the same photoexcited carrier concentration and the ratio of pump to probe in intensity. Negative and oscillating time-delayed signals are observed at central wavelengths of 760 nm and 780 nm and judged to be incorrect physically by comparson with a simulated computation result. It is found by waveform analysis that they are caused by the phase reversal of the output waveforms from a photodetector, while the phase reversal originates from a long lifetime absorption process existing in GaAs sample. It is pointed out that the phase reversal of the waveform can be corrected by raising the ratio of pump to probe in intensity at the photodetector, so that right transient traces can be obtained. However, raising the ratio is incompatible with the viewpoint that the scattered contribution to the photodetector from pump light should be filtered as much as possible. This result has an important reference value for the acquisition of correct ultrafast dynamics using time-resolved pump-probe spectroscopy.
%K time-resolved pump-probe transmission spectroscopy
%K saturated absorption
%K enhanced absorption
%K bulk GaAs<br>时间分辨抽运-探测透射光谱
%K 饱和吸收
%K 吸收增强
%K GaAs体材料
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=7FB288757ED284A0D3461562185B65F3&yid=9377ED8094509821&vid=BFE7933E5EEA150D&iid=708DD6B15D2464E8&sid=2FD4142483A22988&eid=2FD4142483A22988&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=16