Abstract

For the production of fiber waveguides suitable for optical communications cables, glasses with extremely low attenuation are required. A new method is described for measuring the optical attenuation of bulk glasses in the wavelength range of 0.4–1.1 μm. Using a quartz halogen source with highly stabilized radiation power, a linearly polarized, monochromatic, collimated beam was produced, passing the sample at the Brewster angle. Transmission loss, residual reflection, and surface scattering were measured by low-noise photodiodes and integrating digital voltmeters. A stability of 10−5 and a resolution of 10−5 or better were achieved. Results for two different kinds of commercial glasses, fused quartz (Ultrasil) and synthetic vitreous silica (Suprasil W1), are reported and discussed.

© 1975 Optical Society of America

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