Enhancement of far-infrared laser damage threshold in Ge-As-Se glass fiber.

The application of As-Se chalcogenide glasses in high-power laser delivery is hindered by their low damage threshold due to their weak chemical bonds. To solve this, we introduced germanium elements into the As-Se glasses and optimized the composition to raise the glass transition temperature (T) and enhance the laser damage threshold (LDT). From the correlation among various parameters including T, LDT, and fiber loss, we concluded an optimized composition of GeAsSe/GeAsSe glass.