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Self-focusing limits at the laser-plasma interaction for treatment of cataract with nanosecond and picosecond pulses

Published online by Cambridge University Press:  09 March 2009

Rosemarie H. Hora ,
Hans G. L. Coster ,
Clement J. Walter  and
Heinrich Hora
Rosemarie H. Hora
Affiliation:
School of Physics, University of New South Wales, Kensington 2033, Australia
Hans G. L. Coster
Affiliation:
School of Physics, University of New South Wales, Kensington 2033, Australia
Clement J. Walter
Affiliation:
School of Physics, University of New South Wales, Kensington 2033, Australia
Heinrich Hora
Affiliation:
School of Physics, University of New South Wales, Kensington 2033, Australia
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Abstract

Laser pulses are focused in the interior of a human eye in areas of opacity to produce there an optical breakdown resulting in a high-temperature plasma, after which the filling up with liquid results in a transparent area. The empirically given limits for Q-switch laser pulses in the nanosecond range and for mode-locked pulses in the picosecond range are analyzed, and it is shown that these limits are below the self-focusing condition of laser beams in plasmas. A further analysis evaluates theoretically where the maximum limits are given in order to provide the parameters for the highest possible pulse energy that avoids damage in the eye by self-focusing.

Type
Research Article
Information
Laser and Particle Beams , Volume 10 , Issue 1 , March 1992 , pp. 163 - 178
Copyright
Copyright © Cambridge University Press 1992

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