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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 21 — Oct. 21, 2013
  • pp: 24991–24999

Influence of generalized focusing of few-cycle Gaussian pulses in attosecond pulse generation

Ebrahim Karimi, Carlo Altucci, Valer Tosa, Raffaele Velotta, and Lorenzo Marrucci  »View Author Affiliations

Optics Express, Vol. 21, Issue 21, pp. 24991-24999 (2013)

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In contrast to the case of quasi-monochromatic waves, a focused optical pulse in the few-cycle limit may exhibit two independent curved wavefronts, associated with phase and group retardations, respectively. Focusing optical elements will generally affect these two wavefronts differently, thus leading to very different behavior of the pulse near focus. As limiting cases, we consider an ideal diffractive lens introducing only phase retardations and a perfect non-dispersive refractive lens (or a curved mirror) introducing equal phase and group retardations. We study the resulting diffraction effects on the pulse, finding both strong deformations of the pulse shape and shifts in the spectrum. We then show how important these effects can be in highly nonlinear optics, by studying their role in attosecond pulse generation. In particular, the focusing effects are found to affect substantially the generation of isolated attosecond pulses in gases from few-cycle fundamental optical fields.

© 2013 OSA

OCIS Codes
(080.3630) Geometric optics : Lenses
(320.0320) Ultrafast optics : Ultrafast optics
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(050.1965) Diffraction and gratings : Diffractive lenses

ToC Category:
Ultrafast Optics

Original Manuscript: May 30, 2013
Revised Manuscript: July 12, 2013
Manuscript Accepted: July 14, 2013
Published: October 11, 2013

Ebrahim Karimi, Carlo Altucci, Valer Tosa, Raffaele Velotta, and Lorenzo Marrucci, "Influence of generalized focusing of few-cycle Gaussian pulses in attosecond pulse generation," Opt. Express 21, 24991-24999 (2013)

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