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Chin. Phys. B, 2020, Vol. 29(1): 014212    DOI: 10.1088/1674-1056/ab5fc7
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Orientation-dependent depolarization of supercontinuum in BaF2 crystal

Zi-Xi Li(李子熙)1,2, Cheng Gong(龚成)1, Tian-Jiao Shao(邵天骄)1,2, Lin-Qiang Hua(华林强)1, Xue-Bin Bian(卞学滨)1, Xiao-Jun Liu(柳晓军)1
1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  We present a systematic investigation of the depolarization properties of a supercontinuum accompanied with femtosecond laser filamentation in barium fluoride (BaF2) crystal. It is found that the depolarization of the supercontinuum depends strongly on the crystal orientations with respect to the incident laser polarization. At most crystal orientations, the depolarization of the supercontinuum rises with the increase of the input laser energies and finally saturates. While at 45°, the depolarization of the supercontinuum is not changed and keeps nearly negligible with the increase of the input laser energies. These peculiar depolarization properties of the supercontinuum can be ascribed to the orientation dependence of the cross-polarized wave (XPW) generation and ionization-induced plasma scattering in the BaF2 crystal.
Keywords:  femtosecond laser filamentation      supercontinuum      depolarization  
Received:  20 September 2019      Revised:  15 November 2019      Accepted manuscript online: 
PACS:  42.65.Jx (Beam trapping, self-focusing and defocusing; self-phase modulation)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
  42.65.Sf (Dynamics of nonlinear optical systems; optical instabilities, optical chaos and complexity, and optical spatio-temporal dynamics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11527807, 11674356, 11834015, and 91850121), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21010400), and the Open Fund of the State Key Laboratory of High Field Laser Physics, China.
Corresponding Authors:  Cheng Gong, Xiao-Jun Liu     E-mail:  gongcheng@wipm.ac.cn;xjliu@wipm.ac.cn

Cite this article: 

Zi-Xi Li(李子熙), Cheng Gong(龚成), Tian-Jiao Shao(邵天骄), Lin-Qiang Hua(华林强), Xue-Bin Bian(卞学滨), Xiao-Jun Liu(柳晓军) Orientation-dependent depolarization of supercontinuum in BaF2 crystal 2020 Chin. Phys. B 29 014212

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