Transmission properties of hollow glass waveguides

Daniel J. Gibson, James A. Harrington

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


IR transmitting hollow waveguides are an attractive alternative to solid-core IR fibers. Hollow waveguides are made from silica glass or plastic tubing which has highly reflective coatings deposited on the inside surface. These guides have losses as low as 0.1 dB/m at 10.6 μm and may be bent to radii less than 5 cm. For laser-power delivery applications the hollow glass guides have been shown to be capable of transmitting up to 1 kW of CO2 laser power. In some power delivery applications it is necessary to have a distal tip configured to bend and/or concentrate the light for more efficient ablation. Curved tips (2 cm in length) are shown to increase the loss of a 1-m long straight guide from 22 to 34%. New research is described on the fabrication of coherent hollow glass bundles for IR imaging. The number of guides in the bundle is currently <20 but the results indicate that the hollow bundle can be coated to achieve an identical spectral response for each individual guide.

Original languageEnglish (US)
Pages (from-to)143-148
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1999
EventProceedings of the 1999 Infrared Optical Fibers and their Applications - Boston, MA, USA
Duration: Sep 21 1999Sep 22 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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