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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 23 — Dec. 1, 2010
  • pp: 3994–3996

Enhancement of high harmonics generated by field steering of electrons in a two-color orthogonally polarized laser field

Leonardo Brugnera, Felix Frank, David J. Hoffmann, Ricardo Torres, Thomas Siegel, Jonathan G. Underwood, Emma Springate, Chris Froud, Edmond I. C. Turcu, John W. G. Tisch, and Jonathan P. Marangos  »View Author Affiliations


Optics Letters, Vol. 35, Issue 23, pp. 3994-3996 (2010)
http://dx.doi.org/10.1364/OL.35.003994


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Abstract

We demonstrate enhancement by 1 order of magnitude of the high-order harmonics generated in argon by combining a fundamental field at 1300 nm ( 10 14 W cm 2 ) and its orthogonally polarized second harmonic at 650 nm ( 2 × 10 13 W cm 2 ) and by controlling the relative phase between them. This extends earlier work by ensuring that the main effect is the combined field steering the electron trajectory with negligible contribution from multiphoton effects compared to the previous schemes with 800 / 400 nm fields. We access a broad energy range of harmonics (from 20 eV to 80 eV ) at a low laser intensity (far below the ionization saturation limit) and observe deep modulation of the harmonic yield with a period of π in the relative phase. Strong field theoretical analysis reveals that this is principally due to the steering of the recolliding electron wave packet by the two-color field. Our modeling also shows that the atto chirp can be controlled, leading to production of shorter pulses.

© 2010 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(270.6620) Quantum optics : Strong-field processes
(320.0320) Ultrafast optics : Ultrafast optics
(320.7100) Ultrafast optics : Ultrafast measurements

ToC Category:
Nonlinear Optics

History
Original Manuscript: August 25, 2010
Revised Manuscript: October 28, 2010
Manuscript Accepted: October 28, 2010
Published: November 23, 2010

Citation
Leonardo Brugnera, Felix Frank, David J. Hoffmann, Ricardo Torres, Thomas Siegel, Jonathan G. Underwood, Emma Springate, Chris Froud, Edmond I. C. Turcu, John W. G. Tisch, and Jonathan P. Marangos, "Enhancement of high harmonics generated by field steering of electrons in a two-color orthogonally polarized laser field," Opt. Lett. 35, 3994-3996 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-23-3994


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