Enhancing high-order-harmonic generation by time delays between two-color, few-cycle pulses

Authors

Dian Peng, University of Nebraska - LincolnFollow
Liang-Wen Pi, University of Nebraska - Lincoln
M. V. Frolov, Voronezh State University, RussiaFollow
Anthony F. Starace, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

3-16-2017

Citation

PHYSICAL REVIEW A 95, 033413 (2017)
DOI: 10.1103/PhysRevA.95.033413

Comments

©2017 American Physical Society. Used by permission.

Abstract

Use of time delays in high-order-harmonic generation (HHG) driven by intense two-color, few-cycle pulses is investigated in order to determine means of optimizing HHG intensities and plateau cutoff energies. Based upon numerical solutions of the time-dependent Schrõdinger equation for the H atom as well as analytical analyses, we show that introducing a time delay between the two-color, few-cycle pulses can result in an enhancement of the intensity of the HHG spectrum by an order of magnitude (or more) at the cost of a reduction in the HHG plateau cutoff energy. Results for both positive and negative time delays as well as various pulse carrier-envelope phases are investigated and discussed.