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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 6 — Mar. 21, 2005
  • pp: 2025–2031

White-light filaments induced by diffraction effects

K. Cook, A. K. Kar, and R. A. Lamb  »View Author Affiliations

Optics Express, Vol. 13, Issue 6, pp. 2025-2031 (2005)

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The effect of beam spatial profile on self-focusing has been investigated. A circular aperture is used to create a Fresnel diffraction pattern. It is shown that self-focusing (a pre-requisite for filament formation) occurs in the presence of the aperture but that no formation is observed when the aperture is removed, even though the beam has higher power well above the threshold for critical power. An analytical solution to the Huygens-Fresnel diffraction integral shows that the axial intensity oscillates between maxima and minima as the distance from the aperture increases and that filament formation coincides with the presence of an axial maximum.

© 2005 Optical Society of America

OCIS Codes
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Research Papers

Original Manuscript: February 22, 2005
Revised Manuscript: February 28, 2005
Published: March 21, 2005

K. Cook, A. Kar, and R. A. Lamb, "White-light filaments induced by diffraction effects," Opt. Express 13, 2025-2031 (2005)

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