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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 3 — Feb. 4, 2008
  • pp: 1571–1576

Simulated laser-pulse evolution for high-order harmonic generation in a semi-infinite gas cell

Matthew Turner, Nicole Brimhall, Michael Ware, and Justin Peatross  »View Author Affiliations

Optics Express, Vol. 16, Issue 3, pp. 1571-1576 (2008)

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We numerically simulate the propagation of high-intensity laser pulses in helium to investigate the role of nonlinear effects in gas-cell high-harmonics experiments. An aperture located before the focusing lens is also included in the simulation. Numerical results for the radial fluence profile as a function of axial position, as well as for the spectral shift and ionization levels, agree with experimental observations. The simulations confirm that a significant Kerr effect is not required to generate the observed double focus in the fluence. The beam simulation also permits an investigation of high-harmonic phase matching. Most of the harmonic energy is seen to come from the forward portion of the laser pulse, whereas the latter portion gives rise to the incidental double laser focusing. Good phase matching for the harmonics arises in large measure from a balance between the linear phase delay of the neutral atoms and the Gouy shift, which is elongated and nearly linearized when the aperture is partially closed on the beam.

© 2008 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5940) Nonlinear optics : Self-action effects
(190.7110) Nonlinear optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: September 18, 2007
Revised Manuscript: October 26, 2007
Manuscript Accepted: January 22, 2008
Published: January 23, 2008

Matthew Turner, Nicole Brimhall, Michael Ware, and Justin Peatross, "Simulated laser-pulse evolution for high-order harmonic generation in a semi-infinite gas cell," Opt. Express 16, 1571-1576 (2008)

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  1. J. C. Painter, M. Adams, N. Brimhall, E. Christensen, G. Giraud, N. Powers, M. Turner, M. Ware, and J. Peatross, "Direct observation of laser filamentation in high-order harmonic generation," Opt. Lett. 31, 3471-3473 (2006). [CrossRef] [PubMed]
  2. N. Brimhall, J. C. Painter, N. Powers, G. Giraud, M. Turner, M. Ware, and J. Peatross, "Measured laser-beam evolution during high-order harmonic generation in a semi-infinite gas cell," Opt. Express 15, 1684-1689 (2007). [CrossRef] [PubMed]
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  13. J. Sutherland, E. Christensen, N. Powers, S. Rhynard, P. Painter, and J. Peatross, "High harmonic generation in a semi-infinite gas cell," Opt. Express 12, 4430-4436 (2004). [CrossRef] [PubMed]
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