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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 5 — May. 1, 2013
  • pp: 1294–1302

Timing analysis of infrared-driven high-order harmonic generation with above-ionization attosecond pulses

Han Chieh Lee and Tsin Fu Jiang  »View Author Affiliations


JOSA B, Vol. 30, Issue 5, pp. 1294-1302 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001294


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Abstract

We theoretically study infrared (IR)-driven high-order harmonic generation (HHG) assisted by attosecond pulses with a central energy above the atomic ionization threshold. We provide a clear physical picture for controlling HHG using the time delay between the attosecond pulses and the IR laser reported by Faria et al. [Phys. Rev. A 74, 053416 (2006)]. This physical picture also indicates that the combined attosecond pulses and IR laser can help resolve the dynamics of ionized electrons from time-dependent harmonic spectra. We present the quantum effect on HHG as an example. While leaving parent ions, ionized electrons can still emit harmonics in the semi-classically forbidden situation. The two-color excitation provides a practical method to observe the quantum effect experimentally. Furthermore, in our work, attosecond pulses and an IR field are considered with a realistic pulse shape, which shows a quantitatively important effect in controlling harmonic spectra. Accordingly, a guide to optimize the control capability for HHG is presented, and a method to determine the IR carrier-envelope phase based on the pulse-shape effect on the HHG is also proposed.

© 2013 Optical Society of America

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Atomic and Molecular Physics

History
Original Manuscript: December 17, 2012
Revised Manuscript: March 12, 2013
Manuscript Accepted: March 27, 2013
Published: April 23, 2013

Citation
Han Chieh Lee and Tsin Fu Jiang, "Timing analysis of infrared-driven high-order harmonic generation with above-ionization attosecond pulses," J. Opt. Soc. Am. B 30, 1294-1302 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-5-1294

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