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Proceedings Paper

Characterization of hollow silica infrared waveguides
Author(s): James P. Clarkin; John H. Shannon; Richard J. Timmerman
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Paper Abstract

Hollow silica waveguides with internal reflective coatings of silver and silver iodide were tested for optical performance after continuous exposure to 125°C for up to 1300 hours in air. The waveguides were evaluated periodically for mechanical degradation, optical spectral loss, optical loss in bending, and CO2 laser power transmission. The waveguides were found to survive the extended high temperature exposure both mechanically and optically. Mechanically, the internal reflective coatings show no visible signs of deterioration or delamination from the silica tubing substrate. Optically, the waveguides exhibited 1dB/m increase in attenuation at both the 10.6μm and 2.9μm wavelengths for the CO2 and Er:YAG optimized waveguides, respectively. In optical loss in bending, the CO2 optimized waveguides exhibited a 0 -2 dB loss for one 360°, 40cm diameter bend at 10.6μm. The Er:YAG optimized waveguide exhibited higher variability in optical loss in bending and requires further study to determine the true bend loss. The CO2 optimized waveguides were also tested for CO2 (10.6μm) laser power transmission. The change in CO2 laser optical loss pre to post thermal aging was (formula available in book). The post aging waveguides were also shown to transit up to 90W output of CO2 power with no indication of degradation of the internal reflective coatings.

Paper Details

Date Published: 1 July 2003
PDF: 12 pages
Proc. SPIE 4957, Optical Fibers and Sensors for Medical Applications III, (1 July 2003); doi: 10.1117/12.485392
Show Author Affiliations
James P. Clarkin, Polymicro Technologies, LLC (United States)
John H. Shannon, Polymicro Technologies, LLC (United States)
Richard J. Timmerman, Polymicro Technologies, LLC (United States)


Published in SPIE Proceedings Vol. 4957:
Optical Fibers and Sensors for Medical Applications III
Israel Gannot, Editor(s)

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