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.
| Original language | English |
|---|---|
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4257 |
| Pages (from-to) | 303-311 |
| Number of pages | 9 |
| ISSN | 0277-786X |
| DOIs | |
| Publication status | Published - 09.07.2001 |
| Event | Laser-Tissue Interaction XII: Photochemical, Photothermal, and Photomechanical - San Jose, United States Duration: 21.01.2001 → 24.01.2001 Conference number: 58387 |
Research Areas and Centers
- Academic Focus: Biomedical Engineering
