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Proceedings Paper

Hollow-waveguide-based transmission of a Q-switched Nd:YAG laser beam for biological tissue ablation
Author(s): Shunichi Sato; Hiroshi Ashida; Yi-Wei Shi; Yuji Matsuura; Mitsunobu Miyagi
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Paper Abstract

The cyclic-olefin-polymer (COP)-coated silver hollow waveguide has been applied to transmit the 1064-nm, Q-switched Nd:YAG laser beam. The Nd:YAG laser pulses with 14 - 18 ns pulse widths (FWHM) were coupled to the 1-mm inner diameter, 1-m long waveguides. A single-shot laser energy of 142 mJ/pulse (9.8 MW) was transmitted with a transmission efficiency of 95.5% under the straight waveguide condition. The corresponding laser fluence and peak intensity at the waveguide output end reached as high as 18.1 J/cm2 and 1.25 GW/cm2 respectively. It was found that the waveguide bending and the increase in the pulse repetition rate caused decrease in the available maximum transmitted energy. But stable transmission of 50 mJ/pulse (6.5 J/cm2) was obtained at a pulse repetition rate of 10 Hz even under the 90-degree-bent waveguide condition (R equals 50 cm). We conclude that the hollow waveguide has the capability of transmitting high-peak-power (greater than 1 MW) laser pulses for use in some medical applications including tissue- ablation-based treatments.

Paper Details

Date Published: 21 April 1999
PDF: 5 pages
Proc. SPIE 3596, Specialty Fiber Optics for Medical Applications, (21 April 1999); doi: 10.1117/12.346726
Show Author Affiliations
Shunichi Sato, National Defense Medical College Research Institute (Japan)
Hiroshi Ashida, National Defense Medical College Research Institute (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)
Mitsunobu Miyagi, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 3596:
Specialty Fiber Optics for Medical Applications
Abraham Katzir; James A. Harrington, Editor(s)

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