# Same-period emission and recombination in nonsequential double-recombination high-order-harmonic generation

@article{Hansen2016SameperiodEA,
title={Same-period emission and recombination in nonsequential double-recombination high-order-harmonic generation},
author={K. Hansen and Lars Bojer Madsen},
journal={Physical Review A},
year={2016},
volume={93},
pages={053427}
}
• Published 5 April 2016
• Physics
• Physical Review A
Non-sequential double recombination (NSDR) high-order harmonic generation (HHG) is studied in a molecular system. We observe a unique molecular two-electron effect with a characteristic cutoff in the HHG spectrum at higher energies than what was previously seen for NSDR HHG in atoms. The effect is corroborated with a classical model where it is found that the effect is sensitive to the molecular potential and originates from same period emission and recombination (SPEaR) of two electrons. The…
6 Citations

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## References

SHOWING 1-10 OF 10 REFERENCES
Nonsequential double recombination in intense laser fields.
• Physics
Physical review letters
• 2007
A second plateau in the harmonic spectra of laser-driven two-electron atoms is observed both in the numerical solution of a low-dimensional model helium atom and using an extended strong field
High-order harmonic generation from atoms and ions in the high intensity regime.
• Physics
Physical review letters
• 1992
It is found that ions can produce harmonics comparable in strength to those obtained from neutrals, and that the emission extends to much higher order.
Ultrahigh harmonics from laser-assisted ion-atom collisions.
• Physics
Physical review letters
• 2003
We present a theoretical analysis of high-order harmonic generation from ion-atom collisions in the presence of linearly polarized intense laser pulses. Photons with frequencies significantly higher
Theory of high-harmonic generation by low-frequency laser fields.
• Physics
Physical review. A, Atomic, molecular, and optical physics
• 1994
A simple, analytic, and fully quantum theory of high-harmonic generation by low-frequency laser fields is presented and the exact quantum-mechanical formula for the harmonic cutoff that differs from the phenomenological law Ip+3.17Up is presented.
Polarization state of high-order harmonic emission from aligned molecules.
• Physics, Chemistry
Physical review letters
• 2007
It is shown that the polarization of the extreme ultraviolet emission depends strongly on the molecular alignment and the orbital structure, and molecular alignment will allow us to produce attosecond pulses with time-dependent polarization.
Elliptically polarized high-order harmonic emission from molecules in linearly polarized laser fields.
• Physics
Physical review letters
• 2009
It is found that harmonic emission from N2 can be strongly elliptically polarized even when driven by linearly polarized laser fields, which has broad implications for understanding molecules in strong fields.
Interference effects in high-order harmonic generation with molecules
• Physics
• 2002
We study high-order harmonic generation for ${\mathrm{H}}_{2}^{+}$ and ${\mathrm{H}}_{2}$ model molecules in linearly polarized laser pulses by numerical solution of the Schr\"odinger equation.
Calculation of the background emitted during high-harmonic generation.
• Burnett, Reed
• Physics
Physical review. A, Atomic, molecular, and optical physics
• 1992
This method is based on the direct use of the acceleration of the atomic electron rather than the dipole moment of the atom, which produces a more exact numerical evaluation of the spectrum.
Plasma perspective on strong field multiphoton ionization.
• Corkum
• Physics
Physical review letters
• 1993
During strong-field multiphoton ionization, a wave packet is formed each time the laser field passes its maximum value, and one important parameter which determines the strength of these effects is the rate at which the wave packet spreads in the direction perpendicular to the laser electric field.