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

T. Brendel*, R. Brinkmann

*Corresponding author for this work


We investigated Q-switched, TEM00 thulium laser induced bubble formation at a silica-water interface in the abscence 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 8 μm 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.

Original languageEnglish
JournalProceedings of SPIE - The International Society for Optical Engineering
Pages (from-to)303-311
Number of pages9
Publication statusPublished - 09.07.2001
EventLaser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical - San Jose, United States
Duration: 21.01.200124.01.2001
Conference number: 58387

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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