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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 1 — Jan. 7, 2008
  • pp: 237–247

A generalized analysis of femtosecond laser pulse broadening after angular dispersion

Derong Li, Xiaohua Lv, Shaoqun Zeng, and Qingming Luo  »View Author Affiliations

Optics Express, Vol. 16, Issue 1, pp. 237-247 (2008)

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We derive a general analytical expression for the width of a femtosecond laser pulse after passing through an angular dispersion device, valid for the plane wave, spherical wave, and Gaussian beam models. This expression is a simple function of two effects: spectral lateral walkoff and group delay dispersion. Plane waves and spherical waves experience no spectral lateral walkoff, as the beams are not explicitly limited in space. The group delay dispersion (GDD) of a Gaussian beam is similar to that of a plane wave at distances much less than the Rayleigh length, and similar to that of the spherical wave at distances far exceeding the Rayleigh length. The GDD of the spherical wave and Gaussian beam approach a constant value at large distances, which is entirely determined by the dispersion parameters of the optical component and the distance between disperser and source point or beam waist. The width of a plane wave pulse always increases in proportion to the propagation distance. The width of a spherical wave or Gaussian beam pulse widens rapidly at first, but soon levels off to nearly constant value.

© 2008 Optical Society of America

OCIS Codes
(260.2030) Physical optics : Dispersion
(320.0320) Ultrafast optics : Ultrafast optics
(320.5550) Ultrafast optics : Pulses

ToC Category:
Ultrafast Optics

Original Manuscript: October 4, 2007
Revised Manuscript: January 1, 2008
Manuscript Accepted: January 2, 2008
Published: January 3, 2008

Derong Li, Xiaohua Li, Shaoqun Zeng, and Qingming Luo, "A generalized analysis of femtosecond laser pulse broadening after angular dispersion," Opt. Express 16, 237-247 (2008)

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