Highly resolved tracing of Q-switched mid-IR laser-induced vaporization

Tobias Brendel; Ralf Brinkmann

doi:10.1117/12.434713

9 July 2001 Highly resolved tracing of Q-switched mid-IR laser-induced vaporization

Tobias Brendel, Ralf Brinkmann

Proceedings Volume 4257, Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical; (2001) https://doi.org/10.1117/12.434713
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Tobias Brendel and Ralf Brinkmann "Highly resolved tracing of Q-switched mid-IR laser-induced vaporization", Proc. SPIE 4257, Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical, (9 July 2001); https://doi.org/10.1117/12.434713

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