摘要
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.
We investigate nonlinear interaction of nitrogen molecules with a two-color laser field composed by an intense800 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.
作者
Jin-Ming Chen
Jin-Ping Yao
Zhao-Xiang Liu
Bo Xu
Fang-Bo Zhang
Yue-Xin Wan
Wei Chu
Zhen-Hua Wang
Ling-Ling Qiao
Ya Cheng
陈锦明;姚金平;刘招祥;许波;张方波;万悦芯;储蔚;王振华;乔玲玲;程亚(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062;University of Chinese Academy of Sciences,Beijing 100049;School of Physical Science and Technology,ShanghaiTech University,Shanghai 200031;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006)
基金
Supported by the National Key Research and Development Program of China under Grant No 2018YFB0504400
the National Natural Science Foundation of China under Grant Nos 11822410,11734009 and 61575211
the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No XDB16030300
the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant No QYZDJ-SSW-SLH010
the Key Project of the Shanghai Science and Technology Committee under Grant No 18DZ1112700
the Shanghai Rising-Star Program under Grant No 17QA1404600
the Youth Innovation Promotion Association of the Chinese Academy of Sciences under Grant No 2018284
