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

T. Brendel*, R. Brinkmann

*Korrespondierende/r Autor/-in für diese Arbeit

Abstract

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.

OriginalspracheEnglisch
ZeitschriftProceedings of SPIE - The International Society for Optical Engineering
Jahrgang4257
Seiten (von - bis)303-311
Seitenumfang9
ISSN0277-786X
DOIs
PublikationsstatusVeröffentlicht - 09.07.2001
VeranstaltungLaser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical - San Jose, USA / Vereinigte Staaten
Dauer: 21.01.200124.01.2001
Konferenznummer: 58387

Strategische Forschungsbereiche und Zentren

  • Forschungsschwerpunkt: Biomedizintechnik

Fingerprint

Untersuchen Sie die Forschungsthemen von „Highly resolved tracing of Q-switched mid-IR laser induced vaporization“. Zusammen bilden sie einen einzigartigen Fingerprint.

Zitieren