Terahertz wave generation via pre-ionized air plasma

Kai Kang; Liangliang Zhang; Tong Wu; Kai Li; Cunlin Zhang

doi:10.3788/COL201816.110401

Chinese Optics Letters, Volume. 16, Issue 11, 110401(2018)

Terahertz wave generation via pre-ionized air plasma

Kai Kang¹, Liangliang Zhang^1、*, Tong Wu², Kai Li³, and Cunlin Zhang¹

¹Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, and Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University, Beijing 100048, China

²Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

³Daheng New Epoch Technology Inc., Beijing 100085, China

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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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Kai Kang, Liangliang Zhang, Tong Wu, Kai Li, Cunlin Zhang, "Terahertz wave generation via pre-ionized air plasma," Chin. Opt. Lett. 16, 110401 (2018)

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