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Proceedings Paper

Shock wave and cavitation bubble measurements of ultrashort-pulse laser-induced breakdown in water
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Paper Abstract

Laser-induced breakdown (LIB) has long been used in ophthalmic microsurgery as a mechanism for disruption of tissue. The goal of this surgery has been precise tissue cutting by plasma formation and a minimization of collateral damage due to shock wave and cavitation bubble formation. We investigate the strength of the shock wave emission, the size of the cavitation bubble, and the amount of plasma shielding to determine the efficacy of using femtosecond pulses in surgery to reduce collateral photoacoustic damage. A pump-probe technique is used to image the time-resolved evolution of the cavitation bubble produced by focused laser pulses with pulsewidths of 130 fs, 300 fs, 3 ps, and 60 ps. Simultaneously, a hydrophone is used to measure the pressure response generated by the initial plasma shock wave and subsequent shock waves generated by the collapse and rebound of the cavitation bubbles. In addition, transmission measurements are made which indicate the amount of energy shielded beyond the focus by the plasma. These measurements give a good indication of the degree to which collateral damage may be reduced as the pulsewidths is decreased from the picosecond to the femtosecond time regime.

Paper Details

Date Published: 7 May 1996
PDF: 12 pages
Proc. SPIE 2681, Laser-Tissue Interaction VII, (7 May 1996); doi: 10.1117/12.239605
Show Author Affiliations
Daniel X. Hammer, Air Force Armstrong Lab. (United States)
Robert J. Thomas, Air Force Armstrong Lab. (United States)
Martin Frenz, Univ. of Texas/Austin (USA) and Univ. Bern (Switzerland)
E. Duco Jansen, Univ. of Texas/Austin (United States)
Gary D. Noojin, The Analytic Sciences Corp. (United States)
Sarah J. Diggs, The Analytic Sciences Corp. (United States)
Joachim Noack, Medizinisches Laserzentrum Luebeck (Germany)
Alfred Vogel, Medizinisches Laserzentrum Luebeck (Germany)
Benjamin A. Rockwell, Air Force Armstrong Lab. (United States)


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

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