Abstract

We observe the third-harmonic generation and second-harmonic generation together with element fluorescence from the interaction of a femtosecond laser filament with a rough surface sample (sandy soil) in non-phase-matched directions. The harmonics prove to originate from the phase-matched surface harmonics and air filament, then scatter in non-phase-matched directions due to the rough surface. These harmonics occurr when the sample is in the region before and after the laser filament, where the laser intensity is not high enough to excite the element fluorescence. The observed harmonics are related to the element spectroscopy, which will benefit the understanding of the interaction of the laser filament with a solid and be helpful for the application on filament induced breakdown spectroscopy.

© 2017 Chinese Laser Press

Efficient third-harmonic generation through tailored IR femtosecond laser pulse filamentation in air

S. Suntsov, D. Abdollahpour, D. G. Papazoglou, and S. Tzortzakis
Opt. Express 17(5) 3190-3195 (2009)

Optimizing the third harmonic generated from air plasma filaments pumped by femtosecond laser pulses

Yi Liu, Chenhao Kou, Aurélien Houard, and André Mysyrowicz
J. Opt. Soc. Am. B 36(10) G13-G18 (2019)

Generation of an air laser at extended distances by femtosecond laser filamentation with telescope optics

Chenrui Jing, Haisu Zhang, Wei Chu, Hongqiang Xie, Jielei Ni, Bin Zeng, Guihua Li, Jinping Yao, Huailiang Xu, Ya Cheng, and Zhizhan Xu
Opt. Express 22(3) 3151-3156 (2014)

Parabolic trajectory of femtosecond laser filaments generated by accelerating parabolic beams in air

Yuze Hu and Jinsong Nie
J. Opt. Soc. Am. B 34(4) 795-800 (2017)

Femtosecond-laser-induced shockwaves in water generated at an air-water interface

B.D. Strycker, M.M. Springer, A.J. Traverso, A.A. Kolomenskii, G.W. Kattawar, and A.V. Sokolov
Opt. Express 21(20) 23772-23784 (2013)