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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 12 — Jun. 4, 2012
  • pp: 13337–13346

White-light generation using spatially-structured beams of femtosecond radiation

N. Kaya, J. Strohaber, A. A. Kolomenskii, G. Kaya, H. Schroeder, and H. A. Schuessler  »View Author Affiliations

Optics Express, Vol. 20, Issue 12, pp. 13337-13346 (2012)

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We studied white-light generation in water using spatially- structured beams of femtosecond radiation. By changing the transverse spatial phase of an initial Gaussian beam with a 1D spatial light modulator to that of an Hermite-Gaussian (HGn,m) mode, we were able to generate beams exhibiting phase discontinuities and steeper intensity gradients. When the spatial phase of an initial Gaussian beam (showing no significant white-light generation) was changed to that of a HG01, or HG11 mode, significant amounts of white-light were produced. Because self-focusing is known to play an important role in white-light generation, the self-focusing lengths of the resulting transverse intensity profiles were used to qualitatively explain this production. Distributions of the laser intensity for beams having step-wise spatial phase variations were modeled using the Fresnel-Kirchhoff integral in the Fresnel approximation and found to be in good agreement with experiment.

© 2012 OSA

OCIS Codes
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5940) Nonlinear optics : Self-action effects
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Ultrafast Optics

Original Manuscript: April 18, 2012
Revised Manuscript: May 19, 2012
Manuscript Accepted: May 19, 2012
Published: May 30, 2012

N. Kaya, J. Strohaber, A. A. Kolomenskii, G. Kaya, H. Schroeder, and H. A. Schuessler, "White-light generation using spatially-structured beams of femtosecond radiation," Opt. Express 20, 13337-13346 (2012)

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