Complicated high-order harmonic generation due to the falling edge of a trapezoidal laser pulse

Abstract

High-order harmonic generation (HHG) is investigated for H${}_2^{+}$ and its isotopomers under seven- and ten-cycle trapezoidal laser pulses at 800 nm wavelength and $I$=4$\times 10^{14}$ W$/$cm${}^2$ intensity. We solved numerically full-dimensional electronic time-dependent Schrödinger equation with and without the Born-Oppenheimer approximation. We show that the HHG at the falling edge of a trapezoidal laser pulse can result in redshift and complexity on the total HHG spectrum which can be removed by considering different laser pulse duration and nuclear motion not possible for sin${}^2$ and Gaussian laser pulses. We resolve the redshifts and complexities of the HHG spectra into different electronic and vibrational states and their interferences.

arXiv comment9 pages, 11 figures

References in corpus (5)

• Molecular Orientation by Intense Single Cycle THz Pulses
• Time-frequency analysis of chaotic systems
• Detailed instantaneous ionization rate of H${}_2^{+}$ in intense laser field
• Effect of nuclear motion on high-order harmonic generation of H${}_2^{+}$ in intense ultrashort laser pulses
• Nuclear kinetic energy spectra of D_2^+ in intense laser field: Beyond Born Oppenheimer approximation

Cited by in corpus (4)

• Alignment dependent ultrafast electron-nuclear dynamics in high-order harmonic generation
• Understanding molecular harmonic emission at relatively long intense laser pulses: Beyond the Born-Oppenheimer approximation
• Identifying spatially asymmetric high-order harmonic emission during the falling edge of an intense laser pulse
• Contribution of the pre-ionized H${}_2$ and the ionized H${}_2^{+}$ subsystems to the HHG Spectra of H${}_2$ in intense laser fields