Abstract
To suppress the laser-induced air breakdown which limited the transmission of 1064-nm Q-switched Nd:YAG laser pulses through hollow waveguide, a vacuum cell was attached to the waveguide ends, where the air was expelled from the cells as well as from the waveguide core region. With this scheme, the laser-induced air breakdown was completely suppressed, and in addition, the laser-induced damage threshold of the waveguide coating materials was significantly increased. With a 1-mm inner diameter, 1-m long, cyclic-olefin-polymer (COP)-coated silver hollow waveguide, a maximum transmitted laser energy reached approx. 200 mJ/pulse at 10 Hz in a straight waveguide condition. In a 90°-bent waveguide condition the laser-induced damage to the waveguide inner coating was observed, but a maximum transmitted energy in excess of 150 mJ/pulse at 10 Hz was obtained without any damage. With the transmitted laser pulses, sharp ablation in porcine myocardium tissues was demonstrated in vitro.
| Original language | English |
|---|---|
| Pages (from-to) | 298-302 |
| Number of pages | 5 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3911 |
| Publication status | Published - 2000 |
| Externally published | Yes |
| Event | Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II - San Jose, CA, USA Duration: 2000 Jan 25 → 2000 Jan 26 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering