scholarly journals The influence of molecular ground state wave function on high-order harmonic generation from N2 molecules in intense laser fields

2008 ◽  
Vol 57 (3) ◽  
pp. 1616
Author(s):  
Guo Zhong-Hua ◽  
Zhou Xiao-Xin
Keyword(s):  
Wave Function ◽  
Harmonic Generation ◽  
Ground State ◽  
High Order ◽  
Ground State Wave Function ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
High Order Harmonic Generation ◽  
High Order Harmonic ◽  
Molecular Ground State

scholarly journals High-order Harmonic Generation from Hydrogen Molecular Ion in Coherent Superposition State

2020 ◽  
Vol 30 (2) ◽  
pp. 99
Author(s):  
Ngoc-Loan Phan
Keyword(s):  
Harmonic Generation ◽  
Ground State ◽  
Interference Effect ◽  
High Order ◽  
Intense Laser ◽  
Superposition State ◽  
High Order Harmonic Generation ◽  
Coherent Superposition ◽  
High Order Harmonic ◽  
Depletion Effect

Atom in a coherent superposition state reveals an advantage in the enhancement conversion efficiency of high-order harmonic generation (HHG), which is meaningful in producing attosecond pulses. In this study, we expand to investigate a more complicated system, H\(_2^+\) molecule in the superposition of the ground and second excited states, exposed to an ultrashort intense laser pulse by numerically solving the time-dependent Schrödinger equation. Firstly, we examine the enhancement of HHG from this system. Then, we study the depletion effect on the cutoff energy of HHG spectra with the coherent superposition state. We found that these effects on the HHG from molecules are similar to those from atoms. Finally, we study the signature of the interesting effect, which is absent for atoms -- two-center interference effect in the HHG from H\(_2^+\) in the coherent superposition state. We recognize that the minimum positions in HHG from molecules in the superposition state, and in the pure ground state are the same. Especially, for weak laser intensity, in the HHG with the superposition state, the minimum due to the interference effect is apparent, while it is invisible in the HHG from pure ground state. As a result, in comparison with the ground-state molecule, the coherent molecule can be used as a more accurate tool to determine the internuclear distance of molecule.

HIGH-ORDER HARMONIC GENERATION IN INTENSE LASER AND MAGNETIC FIELDS

1995 ◽  
Vol 04 (03) ◽  
pp. 533-546 ◽  
Author(s):  
T. ZUO ◽  
A. D. BANDRAUK
Keyword(s):  
Magnetic Fields ◽  
Harmonic Generation ◽  
Laser Pulses ◽  
High Order ◽  
Intense Laser ◽  
Two Dimensional ◽  
Intense Laser Fields ◽  
High Order Harmonic Generation ◽  
Strong Magnetic Fields ◽  
High Order Harmonic

The effect of strong magnetic fields on high-order harmonic generation is considered for the [Formula: see text] molecule and a two-dimensional hydrogen atom in intense laser fields. Exact solutions of the time-dependent Schrödinger equation reveals: (i) strong magnetic fields parallel to the laser polarization confine the ionized electron wavepacket thereby enhancing the intensity and extending the harmonic generation spectrum; (ii) strong magnetic fields in combination with intense circularly polarized laser pulses can be used to control even and odd harmonic generation in two-dimensional atoms.

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