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Reexamination of wavelength scaling of harmonic yield in intense midinfrared fields

Authors :
Qi Shi
Yunhui Wang
Chao Yu
Yadong Zhang
Shicheng Jiang
Ruifeng Lu
Xu Cao
Source :
Physical Review A. 89
Publication Year :
2014
Publisher :
American Physical Society (APS), 2014.

Abstract

We theoretically investigate harmonic generation driven by intense midinfrared lasers. A valleylike structure is observed at very low-order harmonics because of a low-energy photoelectron suppression effect. Further, at the beginning of a broad supercontinuum, a convex structure appears that is distributed from the tail in a very narrow energy band in time-frequency maps. Surprisingly, our quantum dynamics calculations demonstrate the beneficial wavelength scaling of the harmonic yield to be ${\ensuremath{\lambda}}^{4.6}$ for He and ${\ensuremath{\lambda}}^{5.1}$ for Ne over selected energy windows. The bandwidth of the harmonic plateau with only a single quantum trajectory contribution can be further extended by adding a controlling laser field, and the harmonic efficiency is found to be significantly enhanced after macroscopic propagation. In addition, ultrashort isolated attosecond pulses can be obtained by properly superposing the harmonics in the plateaus of both the He and Ne systems.

Details

ISSN :
10941622 and 10502947
Volume :
89
Database :
OpenAIRE
Journal :
Physical Review A
Accession number :
edsair.doi...........37a7faba85135adc0735525759490389
Full Text :
https://doi.org/10.1103/physreva.89.023825