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19 May 2006 Using air as the nonlinear media for THz wave generation
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We report the first systematic study of broadband THz wave generation by using the focused femtosecond laser beams in ambient air. Generations of pulsed THz waves using air as the nonlinear media have been previously demonstrated by Cook et al. and Hartmut et al. We measured dependence of generated THz wave on the polarization, amplitude and phase of the individually controlled fundamental and second harmonic beams. Our results confirms that four-wave-mixing rectification is the major mechanism of THz wave generation with mixing the fundamental and the SH beams in air. This work is significant by providing the feasibility of standoff distance detection greater than 50 meters.
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Xu Xie, Jianming Dai, Masashi Yamaguchi, and X.-C. Zhang "Using air as the nonlinear media for THz wave generation", Proc. SPIE 6212, Terahertz for Military and Security Applications IV, 62120N (19 May 2006);

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