Details
| Original language | English |
|---|---|
| Article number | 043401 |
| Journal | Physical Review A |
| Volume | 100 |
| Issue number | 4 |
| Publication status | Published - 2 Oct 2019 |
Abstract
We study high-order harmonic generation (HHG) from aligned H2+ and oriented HeH2+ and HeH+ molecular ions in orthogonally polarized two-color laser pulses composed of an intense fundamental field and a time-delayed weak second-harmonic field. By numerical solution of the time-dependent Schrödinger equation, we find that for a fixed alignment angle, as the delay between the two colors varies on a subcycle scale, the HHG intensity from H2+ shows a pronounced groove in a specific delay region, which turns out to be a two-center interference effect. HHG from asymmetric molecules shows an obvious orientation dependence where the interference effect can be observed only when the tunneling occurs on the helium side. The physical origin of these phenomena is deduced by modeling the two-color HHG intensity of H2+ using classical and quantum models and by modeling that of asymmetric molecules with the help of field-free collisions of Gaussian wave packets with the core.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 100, No. 4, 043401, 02.10.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High-order harmonic generation from diatomic molecules in an orthogonally polarized two-color laser field
AU - Zhang, Bing
AU - Lein, Manfred
N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (Grant No. 11504069) and grant provided by the China Scholarship Council (CSC). We thank the Deutsche Forschungsgemeinschaft for support within the Priority Programme “Quantum Dynamics in Tailored Intense Fields” (QUTIF).
PY - 2019/10/2
Y1 - 2019/10/2
N2 - We study high-order harmonic generation (HHG) from aligned H2+ and oriented HeH2+ and HeH+ molecular ions in orthogonally polarized two-color laser pulses composed of an intense fundamental field and a time-delayed weak second-harmonic field. By numerical solution of the time-dependent Schrödinger equation, we find that for a fixed alignment angle, as the delay between the two colors varies on a subcycle scale, the HHG intensity from H2+ shows a pronounced groove in a specific delay region, which turns out to be a two-center interference effect. HHG from asymmetric molecules shows an obvious orientation dependence where the interference effect can be observed only when the tunneling occurs on the helium side. The physical origin of these phenomena is deduced by modeling the two-color HHG intensity of H2+ using classical and quantum models and by modeling that of asymmetric molecules with the help of field-free collisions of Gaussian wave packets with the core.
AB - We study high-order harmonic generation (HHG) from aligned H2+ and oriented HeH2+ and HeH+ molecular ions in orthogonally polarized two-color laser pulses composed of an intense fundamental field and a time-delayed weak second-harmonic field. By numerical solution of the time-dependent Schrödinger equation, we find that for a fixed alignment angle, as the delay between the two colors varies on a subcycle scale, the HHG intensity from H2+ shows a pronounced groove in a specific delay region, which turns out to be a two-center interference effect. HHG from asymmetric molecules shows an obvious orientation dependence where the interference effect can be observed only when the tunneling occurs on the helium side. The physical origin of these phenomena is deduced by modeling the two-color HHG intensity of H2+ using classical and quantum models and by modeling that of asymmetric molecules with the help of field-free collisions of Gaussian wave packets with the core.
UR - http://www.scopus.com/inward/record.url?scp=85073195512&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.100.043401
DO - 10.1103/PhysRevA.100.043401
M3 - Article
AN - SCOPUS:85073195512
VL - 100
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 4
M1 - 043401
ER -