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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 6853–6862

High harmonic emission from a superposition of multiple unrelated frequency fields

T. Siegel, R. Torres, D. J. Hoffmann, L. Brugnera, I. Procino, A. Zaïr, Jonathan G. Underwood, E. Springate, I. C. E. Turcu, L. E. Chipperfield, and J. P. Marangos  »View Author Affiliations

Optics Express, Vol. 18, Issue 7, pp. 6853-6862 (2010)

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We report observations and analysis of high harmonic generation driven by a superposition of fields at 1290 nm and 780 nm. These fields are not commensurate in frequency and the superposition leads to an increase in the yield of the mid-plateau harmonics of more than two orders of magnitude compared to using the 1290 nm field alone. Significant extension of the cut-off photon energy is seen even by adding only a small amount of the 780 nm field. These observations are explained by calculations performed in the strong field approximation. Most importantly we find that enhancement is found to arise as a consequence of both increased ionization in the sum-field and modification of the electron trajectories leading to an earlier return time. The enhanced yield even when using modest intensity fields of 5 x 1013 Wcm−2 is extended to the 80 eV range and is a promising route to provide a greater photon number for applications in XUV imaging and time-resolved experiments at a high repetition rate.

© 2010 OSA

ToC Category:
Nonlinear Optics

Original Manuscript: December 15, 2009
Revised Manuscript: February 1, 2010
Manuscript Accepted: March 7, 2010
Published: March 18, 2010

T. Siegel, R. Torres, D. J. Hoffmann, L. Brugnera, I. Procino, A. Zaïr, Jonathan G. Underwood, E. Springate, I. C. E. Turcu, L. E. Chipperfield, and J. P. Marangos, "High harmonic emission from a superposition of multiple unrelated frequency fields," Opt. Express 18, 6853-6862 (2010)

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