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Proceedings Paper

Shock wave and cavitation bubble dynamics during photodisruption in ocular media and their dependence on the pulse duration
Author(s): Tibor Juhasz; George Kastis; Carlos German Suarez; Laszlo Turi; Zsolt Bor; Walter E. Bron
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Paper Abstract

Shock waves and cavitation bubbles generated by optical breakdown may strongly influence the surgical effect of photodisruptive lasers. We have investigated the shock wave and cavitation bubble effects of femtosecond and picosecond laser pulses generated during photodisruption in corneal tissue and water. Laser pulses with 150 fs duration at approximately 620 nm wavelength have been focused into both corneal tissue and water to create optical breakdown. Pulses with durations of 20 ps have been applied for comparative studies. Time-resolved flash photography has been used to investigate the dynamics of the generated shock waves and cavitation bubbles. Femtosecond pulse engender rapidly decaying shock waves in both materials. The spatial range of shock waves induced by femtosecond laser pulses is considerably smaller than that of shock waves induced by picosecond optical breakdown. Cavitation bubbles excited by femtosecond pulses are observed to develop more rapidly and to reach smaller maximum diameter than those generated by longer pulses. In corneal tissue intrastromal cavitation bubbles generated by femtosecond pulses disappear within a few tens of seconds, notably faster than cavitation bubbles generated by picosecond pulses. The reduced shock wave and cavitation bubble effects of the femtosecond laser result in more localized tissue damage. Therefore, a more confined surgical effect should be expected from a femtosecond laser than that from picosecond (or nanosecond) lasers. This indicates a potential benefit from the application of femtosecond laser technology to intraocular microsurgery.

Paper Details

Date Published: 7 May 1996
PDF: 9 pages
Proc. SPIE 2681, Laser-Tissue Interaction VII, (7 May 1996); doi: 10.1117/12.239603
Show Author Affiliations
Tibor Juhasz, Univ. of California/Irvine (United States)
George Kastis, Univ. of California/Irvine (United States)
Carlos German Suarez, Univ. of California/Irvine (United States)
Laszlo Turi, Jozsef Attila Tudomanyegyetem (Hungary)
Zsolt Bor, Jozsef Attila Tudomanyegyetem (Hungary)
Walter E. Bron, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 2681:
Laser-Tissue Interaction VII
Steven L. Jacques, Editor(s)

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