STRESS-OPTIC COEFFICIENT OF GE-AS-SE CHALCOGENIDE GLASSES

Stress-induced optical retardation at lambda = 1.8 mu m in Ge-As-Se chalcogenide glass disks subjected to a diametral compressive load was measured using a modified IR-polarizing microscope. The computed stress-optic coefficient, B, varied from -29.6 to +5.4 TPa-1 over the glass-forming region. Although the magnitude of B appeared to decrease with increasing Ge content, there appeared to be little direct correlation between B and the average coordination number, [r].