Hollow-waveguide-based transmission of a Q-switched Nd:YAG laser beam for biological tissue ablation

Shunichi Sato; Hiroshi Ashida; Yi-Wei Shi; Yuji Matsuura; Mitsunobu Miyagi

doi:10.1117/12.346726

21 April 1999 Hollow-waveguide-based transmission of a Q-switched Nd:YAG laser beam for biological tissue ablation

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

Proceedings Volume 3596, Specialty Fiber Optics for Medical Applications; (1999) https://doi.org/10.1117/12.346726
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.346726

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