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Dramatic Spectral Broadening of Ultrafast Laser Pulses in Molecular Nitrogen Ions*

Authors :
Wei Chu
Fangbo Zhang
Zhenhua Wang
Chen Jinming
Lingling Qiao
Zhaoxiang Liu
Bo Xu
Jinping Yao
Ya Cheng
Yuexin Wan
Source :
Chinese Physics Letters. 36:104204
Publication Year :
2019
Publisher :
IOP Publishing, 2019.

Abstract

We investigate nonlinear interaction of nitrogen molecules with a two-color laser field composed by an intense 800 nm laser pulse and a weak 400 nm laser pulse. It is demonstrated that the spectrum of 400 nm pulses is dramatically broadened when the two beams temporally overlap. In comparison, the spectral broadening in argon is less pronounced, although argon atoms and nitrogen molecules have comparable ionization potentials. We reveal that the dramatic spectral broadening originates from the greatly enhanced nonlinear optical effects in the near-resonant condition of interaction between the 400 nm pulses and the nitrogen molecular ions.

Details

ISSN :
17413540 and 0256307X
Volume :
36
Database :
OpenAIRE
Journal :
Chinese Physics Letters
Accession number :
edsair.doi...........9c5a0c6b822e05b30ad59bb7f14e2126