Research Papers in Physics and Astronomy

 

Date of this Version

6-29-2018

Citation

PHYSICAL REVIEW LETTERS 120, 263203 (2018)

DOI: 10.1103/PhysRevLett.120.263203

Comments

© 2018 American Physical Society. Used by permission.

Abstract

We study control of high-order harmonic generation (HHG) driven by time-delayed, few-cycle ω and 2ω counterrotating mid-IR pulses. Our numerical and analytical study shows that the time delay between the two-color pulses allows control of the harmonic positions, both those allowed by angular momentum conservation and those seemingly forbidden by it. Moreover, the helicity of any particular harmonic is tunable from left to right circular without changing the driving pulse helicity. The highest HHG yield occurs for a time delay comparable to the fundamental period T = 2π/ω.

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