Frequency spectrum characterization of terahertz emission from laser-induced air plasma
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.
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).
【1】H. Hamster, A. Sullivan, S. Gordon, W. White, and R. W. Falcone, Phys. Rev. E 49, 671 (1994).
【2】X. Xie, J. Dai, and X.-C. Zhang, Phys. Rev. Lett. 96, 075005 (2006).
【3】T. I. Oh, Y. S. You, and K. Y. Kim, Opt. Express 20, 19778 (2012).
【4】J. Dai, X. Xie, and X.-C. Zhang, Phys. Rev. Lett. 97, 103903 (2006).
【5】H. Hamster, A. Sullivan, S. Gordon, W. White, and R. W. Falcone, Phys. Rev. Lett. 71, 2725 (1993).
【6】Z.-M. Sheng, K. Mima, J. Zhang, and H. Sanuki, Phys. Rev. Lett. 94, 095003 (2005).
【10】M. Kress, T. L¨offler, S. Eden, M. Thomson, and H. Roskos, Opt. Lett. 29, 1120 (2004).
【11】X. Xie, J. Dai, and X.-C. Zhang, Phys. Rev. Lett. 96, 075005 (2006).
【12】I.-C. Ho, X. Guo, and X.-C. Zhang, Opt. Express 18, 2872 (2010).
【13】I.-C. Ho and X-C. Zhang, Appl. Phys. Lett. 98, 241908 (2011).
【14】H.-C. Wu, J. Meyer-ter-Vehn, and Z.-M. Sheng, New. J. Phys. 10, 043001 (2008).
【16】H. Harde, R. A. Cheville, and D. Grischkowsky, J. Phys. Chem. A 101, 3646 (1997).
Ji Zhao, Liangliang Zhang, Yiman Luo, Tong Wu, Cunlin Zhang, Yuejin Zhao, "Frequency spectrum characterization of terahertz emission from laser-induced air plasma," Chinese Optics Letters 12(8), 083201 (2014)
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