Near-IR absorption of Ga:La:S and Ga:La:S:O glasses by FEL-based laser calorimetry

摘要

Optical absorption of Ga:La:S and Ga:La:S:O glasses in the near infrared was investigated by laser calorimetry using the free-electron laser source at the Thomas Jefferson National Accelerator Facility. An absorption coefficient of 1.2 and 2.1 x 10-2cm-1 was measured at 1.55 µm for Ga:La:S and Ga:La:S:O respectively. Comparing this result with conventional transmission measurements, we conclude that absorption is the prevailing loss mechanism in the near-IR region for these materials.