Abstract
We demonstrate that the two basic physical mechanisms of terahertz (THz) generation in a femtosecond filament, namely, the free electron photocurrent and the nonlinear polarization of neutrals, can be identified through the spectral analysis of THz radiation. The contribution from the photocurrent peaks at the units of THz, while the neutrals yield the peak at the tens of THz. We suggest the practical implementation of such spectral analysis by varying the initial transform-limited laser pulse duration.
© 2013 Optical Society of America
Full Article | PDF ArticleMore Like This
Jiayu Zhao, Weiwei Liu, Shichang Li, Dan Lu, Yizhu Zhang, Yan Peng, Yiming Zhu, and Songlin Zhuang
Photon. Res. 6(4) 296-306 (2018)
D. Kartashov, S. Ališauskas, A. Pugžlys, A. Voronin, A. Zheltikov, M. Petrarca, P. Béjot, J. Kasparian, J.-P. Wolf, and A. Baltuška
Opt. Lett. 38(16) 3194-3197 (2013)
Boqu He, Junyi Nan, Min Li, Shuai Yuan, and Heping Zeng
Opt. Lett. 42(5) 967-970 (2017)