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

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

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


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°-bent waveguide condition (R = 50 cm). We conclude that the hollow waveguide has the capability of transmitting high-peak-power (>1MW) laser pulses for use in some medical applications including tissue-ablation-based treatments.

Original languageEnglish
Pages (from-to)50-54
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1999 Jan 1
Externally publishedYes
EventProceedings of the 1999 Specialty Fiber Optics for Medical Applications - San Jose, CA, USA
Duration: 1999 Jan 241999 Jan 25

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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