Characterization of hollow silica infrared waveguides

James P. Clarkin; John H. Shannon; Richard J. Timmerman

doi:10.1117/12.485392

1 July 2003 Characterization of hollow silica infrared waveguides

James P. Clarkin, John H. Shannon, Richard J. Timmerman

Proceedings Volume 4957, Optical Fibers and Sensors for Medical Applications III; (2003) https://doi.org/10.1117/12.485392
Event: Biomedical Optics, 2003, San Jose, CA, United States

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.

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James P. Clarkin, John H. Shannon, and Richard J. Timmerman "Characterization of hollow silica infrared waveguides", Proc. SPIE 4957, Optical Fibers and Sensors for Medical Applications III, (1 July 2003); https://doi.org/10.1117/12.485392

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