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Proceedings Paper

Effects of dispersion and aberrations in ocular focusing of femtosecond pulses and the impact on damage mechanisms
Author(s): Jesse H. Shaver; Gavin D. Buffington; Benjamin A. Rockwell; Robert J. Thomas; Clarence P. Cain; Gary D. Noojin; David J. Stolarski
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Paper Abstract

Laser-induced breakdown is believed to be a primary retinal damage mechanism for sub-50 fs laser pulses. Recent studies of ultrashort pulse ocular effects indicate that with frequency chirp compensation, damage thresholds for the retina can be reduced. However, the reductions in threshold do not follow trends predicted by strictly input pulse duration-dependent models. We present a study of the effects of dispersion and the effects of spherical and chromatic aberrations in the propagation of ultrashort laser pulses. We consider optical models of the eye and also common laboratory optical configurations that mimic the eye. Intensity profiles in the focal volume of the optical system are computed for various materials, models, and amounts of aberration. A comparison of relative peak intensities is used to estimate trends in laser-induced breakdown (LIB) thresholds, based upon computation models previously published. These trends in LIB thresholds are compared to experimental data collected in our laboratory.

Paper Details

Date Published: 12 April 2001
PDF: 10 pages
Proc. SPIE 4347, Laser-Induced Damage in Optical Materials: 2000, (12 April 2001); doi: 10.1117/12.425047
Show Author Affiliations
Jesse H. Shaver, Fort Hays State Univ. (United States)
Gavin D. Buffington, Fort Hays State Univ. (United States)
Benjamin A. Rockwell, Air Force Research Lab. (United States)
Robert J. Thomas, TASC, Inc. (United States)
Clarence P. Cain, TASC, Inc. (United States)
Gary D. Noojin, TASC, Inc. (United States)
David J. Stolarski, TASC, Inc. (United States)

Published in SPIE Proceedings Vol. 4347:
Laser-Induced Damage in Optical Materials: 2000
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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