Showing papers by "Jong Heo published in 1990"

Optical and physical effects of iodine in chalcohalide glasses

Abstract: Tellurium and iodine were added to a base chalcogenide glass composition (Ge33Asl2Se5S) to compare their effects on physical and optical properties. Iodine decreased the glass transition temperature and increased thermal expansion to a greater extent than tellurium. However, density was lowered by the presence of iodine and increased by tellurium. Examination of the multiphonon absorption edge in the 300-900 cm1 range revealed that iodine and tellurium occupy different structural sites which accounts for their varied effect on physical properties. There appears to be no advantage of iodine versus tellurium additions with regard to optical fiber applications based on the results obtained.

Loss mechanism analysis of tellurium halide glass optical fibers

Abstract: New IR glasses transmitting from 1 to 20 im and having low loss potentiality in the 8- 12 pm region have been obtained in the Te-Br-Se and Te-I-Se systems. Single index fibers have been drawn from rods and the attenuation measuredin normal atmospheric conditions. The influence ofthe band gap absorption mechanism appears to be very critical as well as the addition ofelements such as Bi which seems to improve the mechnical properties.

New sulphide glasses in the ZrS2-K2S-GeS2 system

Abstract: Etude de 3 series de verre afin d'etudier l'effet de l'addition de ZrS 2 et K 2 S: dans la serie 1ere serie, GeSr 2 est partiellement substitue par ZrSr 2 ; dans la 2eme, la composition de GeS 2 est fixee a 95,90 ou 80% en mole alors que ZrS 2 est substitue par K 2 S; dans la 3eme, K 2 S est ajoute a la place de GeS 2 avec la quantite de ZrS 2 fixee a 1, 2 ou 3% en mole