• Chinese Optics Letters
  • Vol. 16, Issue 4, 040203 (2018)
Hongmei Wu1、2, Shengjun Yue1、2, Jinbin Li1、2, Silin Fu1、2, Bitao Hu1、2, and Hongchuan Du1、2、*
Author Affiliations
  • 1School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
  • 2Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou 730000, China
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    DOI: 10.3788/COL201816.040203 Cite this Article Set citation alerts
    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 Copy Citation Text show less

    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.
    itψ(ρ,z,ϕ;t)=H^ψ(ρ,z,ϕ;t).(1)

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    H^=12(2ρ2+1ρρ+2z2+1ρ22ϕ2)+V(ρ,z)z·E(t)x·E(t),(2)

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    a(t)=ψ(r,t)|[V(r)+r·E(t)]|ψ(r,t),(3)

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    F(ω)=|12π+a(t)eiωtdt|2.(4)

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    E(t)=Ez(t)+Ex(t)=Ez0sin2(πtτ1)sin(ωt)·ez+Ex0sin2[π(t+tdelay)τ2]sin[ω(t+tdelay)]·ex.(5)

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    A(ωN)=PR(ωN)PL(ωN)PR(ωN)+PL(ωN),(6)

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    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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