The change in the absorption loss of IR-transmitting chalcogenide glass fibers in the temperature range of ?90 °C ? <i>T</i> ? 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 ?m. For ? ? 6 ?m the change in loss was mainly due to multiphonon absorption. The change in loss for tellurium-based glass fibers increased significantly at <i>T</i> = 60 °C. The increase in the loss at short wavelengths (? ? 4.1 ?m) was due to electronic excitations in the tail states. Between 5 and 9 ?m there was noticeable free-carrier absorption. Beyond ? ? 9 ?m, multiphonon absorption dominated the loss spectrum.
© 1999 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
Vinh Q. Nguyen, Jas S. Sanghera, Frederic H. Kung, Ishwar D. Aggarwal, and Isabel K. Lloyd, "Effect of Temperature on the Absorption Loss of Chalcogenide Glass Fibers," Appl. Opt. 38, 3206-3213 (1999)