Abstract
The change in the absorption loss of IR-transmitting chalcogenide glass fibers in the temperature range of -90 °C ≤ T ≤ 70 °C 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. For λ ≥ 6 µm the change in loss was mainly due to multiphonon absorption. The change in loss for tellurium-based glass fibers increased significantly at T = 60 °C. The increase in the loss at short wavelengths (λ ≤ 4.1 µm) was due to electronic excitations in the tail states. Between 5 and 9 µm there was noticeable free-carrier absorption. Beyond λ ≥ 9 µm, multiphonon absorption dominated the loss spectrum.
© 1999 Optical Society of America
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