Hollow bent output devices in CO2 laser light delivery system

Katsumasa Iwai, Yi Wei Shi, Yuji Matsuura, Mitsunobu Miyagi, Junko Oishi, Yoshihide Okagami

Research output: Contribution to journalArticlepeer-review


In order to change the output direction of laser light in a small operation space, two types of hollow bent output devices are proposed for medical laser light delivery system. One is the hollow fiber insert-type, which is of the bending radius of 40 mm. The other type, based on a fixed-bent pyrex glass tube, is of the minimum bending radius of 2 mm. Both types of devices are inner-coated with a silver layer and a cyclic olefin polymer (COP) layer. Loss properties for CO2 laser light are clarified for the insert-type devices, called laryngo-tip. And the transmission properties for pilot beams are experimentally discussed. For the fixed-bent tips, the losses are around 0.7 dB, which are almost independent on the bending angles and radii. Transmissions of the tips remain undamaged after 1-hour-delivery of 5 W output CO2 laser light.

Original languageEnglish
Pages (from-to)152-160
Number of pages9
JournalProceedings of SPIE-The International Society for Optical Engineering
Publication statusPublished - 2002 Jan 1


  • CO laser
  • Hollow fiber
  • Output device

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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