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Interference effects on harmonic generation from H2 + in nonhomogeneous laser field
Optics Express
|August 25, 2016
Summary
High-order harmonic generation in hydrogen molecular ions (H2+) was studied. Nonhomogeneous laser fields produced distinct interference minima, showing laser parameters significantly influence these effects.
Area of Science:
- Atomic and Molecular Physics
- Quantum Optics
- Laser-Matter Interactions
Background:
- High-order harmonic generation (HHG) is a fundamental process in strong-field physics.
- Understanding HHG in molecules like H2+ provides insights into electron dynamics and interference phenomena.
Purpose of the Study:
- To investigate high-order harmonic generation (HHG) from H2+ in spatially symmetric and asymmetric nonhomogeneous laser fields.
- To analyze the influence of laser field parameters on two-center interference in diatomic molecules.
Main Methods:
- Solving the time-dependent Schrödinger equation in one-dimensional and three-dimensional cylindrical coordinate systems.
- Utilizing quantum dynamics calculations to analyze electron recollision and harmonic spectra.
Main Results:
- Distinct minima were observed in the high-energy part of harmonic spectra at large internuclear distances, attributed to two-center interference.
- Minima in nonhomogeneous laser fields were more distinct than in previous studies.
- The positions of interference minima varied with different laser field parameters, demonstrating their significant influence.
Conclusions:
- Nonhomogeneous laser fields enhance the visibility of two-center interference in H2+.
- Laser field asymmetry leads to asymmetric electron recollision, enabling the emission of both odd and even harmonic orders.
- Quantum dynamics calculations provide a detailed explanation of the observed phenomena.
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