Effect of heating on the optical loss in the As-Se glass fiber

The increase in the optical loss of the IR-transmitting arsenic-selenide glass fiber in the temperature range of 150(degree)C >T> 20(degree)C was investigated. Between the wavelength region of 1.3 and 8 (mu)m, there is a small increase in the loss in which the contribution of free-carrier absorption is small. At high temperature T=150(degree)C and (lambda)>8 (mu)m, both the free-carrier and multiphonon absorption contributed to the total loss. From a practical perspective, the As-Se fiber loss increases only slightly under normal operating temperatures and so can still be used for many applications.