Chinese Optics Letters, 2018, 16 (4): 040203, Published Online: Jul. 12, 2018  

Controlling nonadiabatic spectral redshift of high-order harmonic using two orthogonally polarized laser fields

Author Affiliations
1 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
2 Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou 730000, China
Abstract
We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by properly adjusting the time delay of the two laser fields when the controlling pulse is added in the raising part of the driving pulse in the vertical direction. That is because the controlling pulse in the vertical direction prevents the ionized electrons from returning to the vicinity of parent ions and then reduces the recombination probability. This leads to the high-order harmonic generated mainly in the falling part of the driving pulse. Meanwhile, we also find that the quantity of redshift can be effectively controlled through accommodating the positive time delays. In addition, this scheme can also be used to produce nonadiabatic spectral blueshift.

Hongmei Wu, Shengjun Yue, Jinbin Li, Silin Fu, Bitao Hu, Hongchuan Du. Controlling nonadiabatic spectral redshift of high-order harmonic using two orthogonally polarized laser fields[J]. Chinese Optics Letters, 2018, 16(4): 040203.

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