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3 November 2016 Wavelength scaling of terahertz generation via two color photoionization in pre-formed plasma
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For further understanding of the mechanism regarding terahertz (THz) wave generation in laser-induced plasma, the pump wavelength dependence of THz emission is examined when two-color laser fields are mixed in pre-formed plasma created by another 800nm laser pulse. In our experiment, the effect of pre-formed plasma is investigated using an orthogonal pumping geometry. With a pre-formed plasma, the power of THz wave generated by the pump pulse reduces significantly, and the THz modulation increases with the growth of pump wavelength. Possible reason for the result is discussed in terms of tunneling ionization in the THz generation mechanism.
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Suxia Huang, Hang Zhao, Cunlin Zhang, and Liangliang Zhang "Wavelength scaling of terahertz generation via two color photoionization in pre-formed plasma", Proc. SPIE 10030, Infrared, Millimeter-Wave, and Terahertz Technologies IV, 100301T (3 November 2016);


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