Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5488365 | Chinese Journal of Physics | 2017 | 14 Pages |
Abstract
The generation of the higher-order harmonics and attosecond pulses from H2+ driven by an asymmetric few-cycle inhomogeneous laser field has been theoretically investigated. It is found that (i) due to the asymmetric enhancement of the laser intensity in space, larger extensions of the harmonics with only one harmonic emission event from E(t) >â¯0 and E(t) <â¯0 can be found for the cases of positive and the negative asymmetric inhomogeneous fields, respectively. Moreover, due to the asymmetric inhomogeneous effect, the modulation of the harmonics, caused by the coupling of the two quantum paths can be decreased. (ii) As the polarization angle of the laser field increases, not only the intensities and the cutoffs of the harmonics are decreased, but also the modulation of the harmonics are enhanced. (iii) The contribution of the harmonic plateau can be controlled by changing the carrier-envelope phase of the laser field or by properly adding controlling pulses (e.g. adding a second controlling pulse with a longer wavelength or adding a half-cycle pulse). As a result, a supercontinuum with the bandwidth of 434â¯eV and a near-isolated 37 as pulse can be obtained.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Atomic and Molecular Physics, and Optics
Authors
Feng Liqiang, Feng Rick C., Li Yi,