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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 24 — Aug. 20, 1999
  • pp: 5168–5180

Nonlinear optical beam propagation for optical limiting

Dmitriy I. Kovsh, Sidney Yang, David J. Hagan, and Eric W. Van Stryland  »View Author Affiliations


Applied Optics, Vol. 38, Issue 24, pp. 5168-5180 (1999)
http://dx.doi.org/10.1364/AO.38.005168


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Abstract

We implement numerical modeling of high-energy laser-pulse propagation through bulk nonlinear optical materials using focused beams. An executable program with a graphical user interface is made available to researchers for modeling the propagation of beams through materials much thicker than the diffraction length (up to 103 times longer). Ultrafast nonlinearities of the bound-electronic Kerr effect and two-photon absorption as well as time-dependent excited-state and thermal nonlinearities are taken into account. The hydrodynamic equations describing the rarefaction of the medium that is due to heating are solved to determine thermal index changes for nanosecond laser pulses. We also show how this effect can be simplified in some cases by an approximation that assumes instantaneous expansion (so-called thermal lensing approximation). Comparisons of numerical results with several Z-scan, optical limiting and beam distortion experiments are presented. Possible application to optimization of a passive optical limiter design is discussed.

© 1999 Optical Society of America

OCIS Codes
(190.3270) Nonlinear optics : Kerr effect
(190.4180) Nonlinear optics : Multiphoton processes
(190.4870) Nonlinear optics : Photothermal effects
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5940) Nonlinear optics : Self-action effects

History
Original Manuscript: February 18, 1999
Revised Manuscript: May 26, 1999
Published: August 20, 1999

Citation
Dmitriy I. Kovsh, Sidney Yang, David J. Hagan, and Eric W. Van Stryland, "Nonlinear optical beam propagation for optical limiting," Appl. Opt. 38, 5168-5180 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-24-5168

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