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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 4, Iss. 8 — Apr. 12, 1999
  • pp: 315–327

Numerical modeling of thermal refraction in liquids in the transient regime

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

Optics Express, Vol. 4, Issue 8, pp. 315-327 (1999)

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We present the results of modeling of nanosecond pulse propagation in optically absorbing liquid media. Acoustic and electromagnetic wave equations must be solved simultaneously to model refractive index changes due to thermal expansion and/or electrostriction, which are highly transient phenomena on a nanosecond time scale. Although we consider situations with cylindrical symmetry and where the paraxial approximation is valid, this is still a computation-intensive problem, as beam propagation through optically thick media must be modeled. We compare the full solution of the acoustic wave equation with the approximation of instantaneous expansion (steady-state solution) and hence determine the regimes of validity of this approximation. We also find that the refractive index change obtained from the photo-acoustic equation overshoots its steady-state value once the ratio between the pulsewidth and the acoustic transit time exceeds a factor of unity.

© Optical Society of America

OCIS Codes
(190.4870) Nonlinear optics : Photothermal effects
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(190.5940) Nonlinear optics : Self-action effects

ToC Category:
Research Papers

Original Manuscript: March 15, 1999
Published: April 12, 1999

Dmitriy Kovsh, David Hagan, and Eric Van Stryland, "Numerical modeling of thermal refraction inliquids in the transient regime," Opt. Express 4, 315-327 (1999)

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