Volume 127, Number 3, August 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||13 September 2019|
Role of quantum orbits in odd-even high harmonic generation from atoms in bichromatic laser fields
1 College of Physics and Information Technology, Shaanxi Normal University - Xi'an 710119, China
2 Institute of Atomic and Molecular Physics and Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Jilin University - Changchun 100312, China
3 College of Physical Science and Information Engineering, Hebei Normal University - Shijiazhuang 050024, China
Received: 3 June 2019
Accepted: 4 August 2019
We study high-order harmonic generation from atoms in bichromatic laser fields numerically and analytically. With the weak increase of the second harmonic field, the calculated odd and even HHG spectra differ remarkably from each other in some energy regions. Our analyses reveal that the interference of two neighboring quantum orbits plays an important role in this phenomenon. In particular, we show that with a trajectory-resolved approach, the emission of odd or even harmonics can be effectively controlled in a wide HHG energy region. Our results suggest a potential approach for generating even-harmonic-dominating attosecond pulse.
PACS: 42.65.Ky – Frequency conversion; harmonic generation, including higher-order harmonic generation / 42.50.Hz – Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift
© EPLA, 2019
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