Acta Optica Sinica, Volume. 29, Issue 3, 781(2009)
Elliptical Polarized Single-Cycle THz Pulse Generated by Femtosecond Laser Filamentation in Air
Strong forward propagated THz pulse can be generated by femtosecond laser filamentation in air. An electro-optical sampling based time domain spectroscopy (TDS) technique is used to diagnose the THz pulse produced by a femtosecond laser filament in air. The filament is generated by a 1 mJ, 50 fs laser pulse centered at 800 nm. The THz pulse measured in experiment is a single-cycle pulse (pulse width is 1ps) and the corresponding spectrum peak value is around 1 THz. The polarization orieatation of pump beam is rotated and the variation of electro-optical sampling signal is analyzed-Compared the experimental results with the calculational results, the polarization of THz pulse emitted from filamentation is elliptical.
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Zhang Yizhu, Chen Yanping, Li Zhiqiang, Xu Shengqi, Liu Weiwei, See Leang Chin. Elliptical Polarized Single-Cycle THz Pulse Generated by Femtosecond Laser Filamentation in Air[J]. Acta Optica Sinica, 2009, 29(3): 781