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Proceedings Paper

Highly resolved tracing of Q-switched mid-IR laser-induced vaporization
Author(s): Tobias Brendel; Ralf Brinkmann
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Paper Abstract

We investigated Q-switched, TEM00 thulium laser induced bubble formation at a silica-water interface in the absence of a speckle pattern. An optical bubble detection unit of high sensitivity was developed to observe on-line the bubble formation onset. Additional fast flash photographs revealed a heterogeneous bubble onset close by the silica surface, at a maximum distance of 8micrometers from the surface. Under control of the optical detection unit, threshold radiant exposures for bubble formation were determined. Strong threshold variation was observed, when replacing a silica surface by another. By performing a series of 45 threshold measurements on different silica surfaces of same 60/40 (scratch and dig) quality, threshold radiant exposures in a range between 26 mJ/mm2 and 95 mJ/mm2 were found, with equal distribution of the 45 threshold values over this range. With help of the gas entrapping crevice model we present a first interpretation of our results. They show, in conclusion, that accurate predictions of the bubble onset solely as a function of irradiation parameters cannot be made.

Paper Details

Date Published: 9 July 2001
PDF: 9 pages
Proc. SPIE 4257, Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical, (9 July 2001); doi: 10.1117/12.434713
Show Author Affiliations
Tobias Brendel, Medical Laser Ctr. Luebeck GmbH (Germany)
Ralf Brinkmann, Medical Laser Ctr. Luebeck GmbH (Germany)

Published in SPIE Proceedings Vol. 4257:
Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical
Donald Dean Duncan; Donald Dean Duncan; Steven L. Jacques; Peter C. Johnson; Peter C. Johnson, Editor(s)

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