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Chin. Opt. Lett.
 Home  List of Issues    Issue 12 , Vol. 15 , 2017    10.3788/COL201715.120201


Polarization effect on critical power and luminescence in an air filament
Chang Liu, Hongwei Zang, Helong Li, Yanhao Yu, and Huailiang Xu
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, [Jilin University], Changchun 130012, China

Chin. Opt. Lett., 2017, 15(12): pp.120201

DOI:10.3788/COL201715.120201
Topic:Atomic and molecular physics
Keywords(OCIS Code): 020.2649  300.6280  260.5950  260.5210  190.3270  

Abstract
We demonstrate that the filamentation process is strongly influenced by the polarization state of the driver laser. When the laser polarization changes from linear to circular, the critical power for the self-focusing of a Ti:Sapphire laser (800 nm, 40 fs) in air increases from about 9.6±1.0 to ?14.9±1.5?GW, while the second nonlinear refractive index n2 of air decreases from ?9.9?×?10?20? to ?6.4?×?10?20 ?cm2/W. We also demonstrate that the luminescence from the neutral nitrogen molecules at 337 nm is dependent on both the laser intensity and plasma density inside the filament.

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Received:2017/6/14
Accepted:2017/10/13
Posted online:2017/11/2

Get Citation: Chang Liu, Hongwei Zang, Helong Li, Yanhao Yu, and Huailiang Xu, "Polarization effect on critical power and luminescence in an air filament," Chin. Opt. Lett. 15(12), 120201(2017)

Note: This work was supported in part by the National Natural Science Foundation of China (Nos. 61625501, 61427816, and 61235003), the National Basic Research Program of China (No. 2014CB921300), the Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM), and the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) (No. 2017TD-21).



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