Abstract

Terahertz (THz) wave generation process in air plasma was studied using femtosecond laser pulse pairs. The effect of preexisting air plasma was investigated using two optical geometries: collinear and orthogonal pumping geometry. When the air plasma is excited in collinear geometry, the power of the generated THz wave shows asymmetric dependence on the relative delay of these pulses. The asymmetry depends on the relative intensities of these pump pulses, and it disappears when the pulses have equal intensities. In the orthogonal pumping geometry, the power of the THZ wave generated by the main pump pulse decreases in the presence of the preexisting plasma generated by the prepulse, and it recovers as the relative delay between the prepulse and main pulses becomes longer. Possible mechanisms of the results are discussed in terms of the dynamics of free electrons in the air plasma.

© 2013 Optical Society of America

Enhancement of terahertz waves from two-color laser-field induced air plasma excited using a third-color femtosecond laser

Danni Ma, Liquan Dong, Minghao Zhang, Tong Wu, Yuejin Zhao, Liangliang Zhang, and Cunlin Zhang
Opt. Express 28(14) 20598-20608 (2020)

Polarization of terahertz radiation from laser generated plasma filaments

Daniel Dietze, Juraj Darmo, Stefan Roither, Audrius Pugzlys, James N. Heyman, and Karl Unterrainer
J. Opt. Soc. Am. B 26(11) 2016-2027 (2009)

Active stabilization of terahertz waveforms radiated from a two-color air plasma

Yonghao Mi, Kyle Johnston, Valentina Shumakova, Søren H. Møller, Kamalesh Jana, Chunmei Zhang, André Staudte, Shawn Sederberg, and Paul B. Corkum
Photon. Res. 10(1) 96-103 (2022)

Terahertz wave generation in nitrogen gas using shaped optical pulses

Masashi Yamaguchi and Jayashis Das
J. Opt. Soc. Am. B 26(9) A90-A94 (2009)

Excitation-wavelength dependent terahertz wave polarization control in laser-induced filament

Liangliang Zhang, Shijing Zhang, Rui Zhang, Tong Wu, Yuejin Zhao, Cunlin Zhang, and X.-C. Zhang
Opt. Express 25(26) 32346-32354 (2017)