Cu/Cul-coated hollow glass waveguides for delivery of infrared radiation

Roshan George, James A. Harrington

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


IR-transmissive hollow waveguides have been fabricated by depositing Cu and Cul thin-film coatings inside silica and polycarbonate tubing. These guides, which are similar in design to Ag/Agl-coated ones, have straight losses as low as 0.19 dB/m for a 1000-μm-bore waveguide at 10.6 μm. They also transmit IR wavelengths from 2 to more than 15 μm. This makes them very useful for broadband IR applications, including chemical sensing and radiometry, as well as for use in the delivery of IR laser power for laser surgery and low-power cutting. The thin-film coatings are deposited using a liquid-chemistry technique in which a Cu film is first formed on the inside of the tubing, followed by the deposition of the dielectric Cul layer. The thickness of the Cul layer is adjusted to give low loss at specific IR laser wavelengths or to give a broadband response for the transmission of incoherent light.

Original languageEnglish (US)
Article number055004
JournalOptical Engineering
Issue number5
StatePublished - May 2006

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)


  • CO laser delivery systems
  • Hollow waveguides
  • Infrared fiber optics


Dive into the research topics of 'Cu/Cul-coated hollow glass waveguides for delivery of infrared radiation'. Together they form a unique fingerprint.

Cite this