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Frequency spectrum characterization of terahertz emission from laser-induced air plasma

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Abstract

Terahertz (THz) emission from laser-induced air-plasma is presented. The frequency spectra of THz wave are investigated using an air-biased-coherent-detection method. The frequency spectra are measured under different pump-pulse and probe-pulse energies. The frequency spectra become narrow with the increasing pump power and we speculate it caused by collision behavior. Meanwhile, the bandwidth of the frequency spectra is broadened by the increasing probe power, which can be explained by pulse compression. Based on this finding, the optimal frequency spectrum of THz can be achieved by regulating the probe and pump beam.

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DOI:10.3788/col201412.083201

所属栏目:Ultrafast optics

责任编辑:张雁

收稿日期:2014-04-02

录用日期:2014-04-29

网络出版日期:2014-07-18

联系人作者:联系作者(yjzhao@bit.edu.com)

备注:This work was supported by the National Natural Science Foundation of China (Nos. 11374007 and 61377109), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (No. 201237), and the Support Program for Outstanding Ph.D. Advisors (No.YB20101000701).

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