Volume 126, Number 2, April 2019
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||03 June 2019|
High-order harmonic generation from molecular ions in the coherent electronic states
College of Physics and Information Engineering, Shanxi Normal University - Linfen 041004, China and Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, Shanxi Normal University Linfen 041004, China
Received: 24 January 2019
Accepted: 26 April 2019
The high-order harmonic generation from the tritium molecular ions in the coherent state has been numerically simulated by solving the three-state time-dependent Schrödinger equation based on the non-Born-Oppenheimer approximation. Two resonant pump pulses prepare the system in the coherent superposition of the and the states. A long-wavelength probe pulse is selected to generate the intense harmonics. By increasing the population of the state, the dependence of the harmonic spectra on pump-probe delay time tends to exhibit obvious redshift. In this work, not only is the physical image of harmonic emission from coherent wave packets established, but also a new physical mechanism of the redshift in long-wavelength region is revealed. Moreover, we present a scheme of manipulating the redshift to further verify the underlying mechanism.
PACS: 32.80.Rm – Multiphoton ionization and excitation to highly excited states / 42.65.Re – Ultrafast processes; optical pulse generation and pulse compression / 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation
© EPLA, 2019
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