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22 August 2011 Application of time-resolved pump-probe system in researching photoconductive material
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The transient electrical signal generated by ultrafast photoconductive material irradiated by ultrashort pulse laser is measured by the time-resolved pump-probe system. The usual pump-probe experimental setup is used to study dynamic change inside the material by measuring the change of the laser beam reflectivity or transmisivity. In this paper, the experimental setup is improved to directly measure transient electrical signals generated by photoconductive material. The improved experimental setup can directly reflect the carrier status inside the photoconductive material compared to the usual experimental setup, and the response rate of photoconductive material can be studied by measuring the transient electrical signal. The work process of the experimental measurement is described. Especially the detection process of the pump-probe is analyzed in detail. The method of determining the zero of delay time of the experimental system is presented. The measurement results showed that the width of transient electrical signals measured is on the level of picosecond. Finally, the signal to noise ratio (SNR) of the improved experimental setup has been analyzed.
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Zhenmin Shen and Tian Lan "Application of time-resolved pump-probe system in researching photoconductive material", Proc. SPIE 8192, International Symposium on Photoelectronic Detection and Imaging 2011: Laser Sensing and Imaging; and Biological and Medical Applications of Photonics Sensing and Imaging, 819238 (22 August 2011);

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