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21 April 1999 Hollow-waveguide-based transmission of a Q-switched Nd:YAG laser beam for biological tissue ablation
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Proceedings Volume 3596, Specialty Fiber Optics for Medical Applications; (1999)
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States
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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Shunichi Sato, Hiroshi Ashida, Yi-Wei Shi, Yuji Matsuura, and Mitsunobu Miyagi "Hollow-waveguide-based transmission of a Q-switched Nd:YAG laser beam for biological tissue ablation", Proc. SPIE 3596, Specialty Fiber Optics for Medical Applications, (21 April 1999);

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