Abstract

Metal/dielectric-coated hollow glass waveguides (HGWs) have been studied extensively for the efficient transmission of radiation over a broad spectral range. In this study, a low-absorption optical polymer, cyclic olefin copolymer (COC), is investigated as a dielectric material for HGWs designed for the delivery of various IR lasers. Using established silver (Ag) plating techniques and a newly optimized polymer-coating procedure, Ag/COC HGWs with low attenuation coefficients are fabricated for operation at the following three wavelengths: 808 nm, 1.064 μm, and 2.94 μm. The spectral responses of the HGW designs are used to develop a film thickness dependency of the COC layer formation based on the concentration of the solution used in the polymer deposition procedure. Further, the attenuation coefficients of the HGWs are measured using the cutback method at the three wavelengths as a function of the curvature of the waveguide. In order of increasing operation, the attenuation coefficients are measured to be 0.549, 0.095, and 0.298dB/m for the HGWs in the straight configuration. These experimental values for the straight attenuation coefficients are compared to theoretical values calculated using a ray transfer matrix approach and are found to be in good agreement.

© 2015 Optical Society of America

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