Optical properties in chalcogenide glasses and their temperaturedependence. : Literary survey and experiments.

Sammanfattning: This study aimed to investigate methods for determining the temperature dependence of the refractive index and absorption of IR-transparent materials through literary studies and experimental tests. Results from the experimental trials were hard to obtain due to the inherent difficulty of measuring optical properties and yielded only temperature trends of transmittance and reflectance. Despite this, the results could be used for speculation regarding the temperature dependency of the refractive index and the absorption which provides insights into the optical properties of a material. There are several suggestions to improve measurements using this method for future work to be able to determine precise values of the properties. Two additional methods have been reviewed with a literary study, the minimum deviation prism method and the improved Swanepoel thin film method. Both methods are regarded as promising candidates for determining refractive index and its temperature dependence with good accuracy. However, the improved Swanepoel method stands out as the more promising candidate. The determination of absorption and its temperature dependence is established to be inherently hard to determine with the experimental method and the two researched methods, thus suggestions for measuring the absorption in future work are given.