Harmonic generation at air–soil interface by femtosecond laser filament
Na Chen1;2, Yaoxiang Liu2, Tiejun Wang2, Zhongbin Zhu1;2, Haiyi Sun2, Xiaona Yan1, Yunhua Xia3, Jinhua Xia3, Juan Du2, Jiansheng Liu2, and Yuxin Leng2
1 Department of Physics, College of Science, [Shanghai University], Shanghai 200444, China
2 State Key Laboratory of High Field Laser Physics, [Shanghai Institute of Optics and Fine Mechanics], The Chinese Academy of Sciences, Shanghai 2 01800, China
3 [Suzhou Zhongkehuisheng Bio-technology Co., Ltd.], Suzhou 215104, China

Chin. Opt. Lett., 2017, 15(06): pp.061902

DOI:10.3788/COL201715.061902
Topic:Nonlinear optics
Keywords(OCIS Code): 190.7110  300.6365  300.6490  260.5950  

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.

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Received:2017/1/14
Accepted:2017/3/3
Posted online:2017/3/22

Get Citation: Na Chen, Yaoxiang Liu, Tiejun Wang, Zhongbin Zhu, Haiyi Sun, Xiaona Yan, Yunhua Xia, Jinhua Xia, Juan Du, Jiansheng Liu, and Yuxin Leng, "Harmonic generation at air–soil interface by femtosecond laser filament," Chin. Opt. Lett. 15(06), 061902(2017)

Note: The authors appreciate Prof. Ruxin Li from SIOM for his suggestion to initiate the project. Fruitful discussions from Prof. See Leang Chin from Laval University are acknowledged. This work was supported in part by the Strategic Priority Research Program (B) (No. XDB16), the Key Project from the Bureau of International Cooperation Chinese Academy of Sciences (No. 181231KYSB20160045), and the 100 Talents Program of the Chinese Academy of Sciences and the State Key Laboratory of High Field Laser Physics.



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