Vacuum-cored hollow waveguide for high-energy, high-intensity laser transmission and its application to biological tissue ablation

Shunichi Sato, Tsunenori Arai, Yi Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, Hiroshi Ashida

Research output: Contribution to journalConference article

2 Citations (Scopus)

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 languageEnglish
Pages (from-to)298-302
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3911
Publication statusPublished - 2000 Jan 1
Externally publishedYes
EventBiomedical Diagnostic, Guidance, and Surgical-Assist Systems II - San Jose, CA, USA
Duration: 2000 Jan 252000 Jan 26

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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