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

doi:10.1117/12.384917

3 May 2000 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

Author Affiliations +

Proceedings Volume 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II; (2000) https://doi.org/10.1117/12.384917
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

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 for 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. Wit a 1-mm inner diameter, 1-m long, cyclic-olefin-polymer- coated silver hollow waveguide, a maximum transmitted laser energy reached approximately 200 mJ/pulse at 10 Hz in a straight waveguide condition. In a 90 degree-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.

Citation Download Citation

Shunichi Sato, Tsunenori Arai, Yi-Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, and Hiroshi Ashida "Vacuum-cored hollow waveguide for high-energy high-intensity laser transmission and its application to biological tissue ablation", Proc. SPIE 3911, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems II, (3 May 2000); https://doi.org/10.1117/12.384917

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