Effect of temperature on the absorption loss of chalcogenide glass fibers

摘要

The change in the absorption loss of IR-transmitting chalcogenide glass fibers in the temperature range of-90℃≤T ≤70 ℃was investigated. For sulfur-based glass fibers the change in loss relative to room temperature was slightly affected by the temperature in the wavelength region of 1-5 μm.Forλ≥6μm the change in loss was mainly due to multiphonon absorption. The change in loss for tellurium-based glass fibers increased significantly at T = 60 ℃. The increase in the 1oss at short wavelengths(λ≤4.1μm) was .due to electronic excitations in the tail states. Between 5 and 9μm there was noticeable free-carrier absorption. Beyondλ≥9μm, multiphonon absorption dominated the loss spectrum. #1999 Optical Society of America OCIS codes: 060.2280, 060.2310, 060.2390, 060.2290, 060.2270.