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  • Received: Aug. 13, 2018

    Accepted: Sep. 27, 2018

    Posted: Jan. 17, 2019

    Published Online: Nov. 14, 2018

    The Author Email: Liangliang Zhang (zhlliang@126.com)

    DOI: 10.3788/COL201816.110401

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    Kai Kang, Liangliang Zhang, Tong Wu, Kai Li, Cunlin Zhang. Terahertz wave generation via pre-ionized air plasma[J]. Chinese Optics Letters, 2018, 16(11): 110401

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Fig. 1. Experimental setup. L: convex lens. PM: parabolic mirror.

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Fig. 2. (a) THz time-domain waveforms and (b) THz frequency-domain spectra with different modulation powers. The pump power is set as 0.6 W.

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Fig. 3. (a) THz signal of three representative excitation pump powers of 0.4 W, 0.6 W, and 0.8 W in the presence of pre-formed plasma as a function of the relative time between the pump beam and the modulation beam. (b) The effect of the modulated laser intensity on the THz wave modulation depth.

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Fig. 4. THz wave polarization under different modulation powers.

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