Abstract
The acousto-optic (AO) characteristics of the 80GeSe2-20Ga2Se3 chalcogenide glass and glass-ceramic (GC) samples at 10.6 μm is compared for the first time in this study. The thermomechanical performance and AO figure of merit M2 (189 × 10―18 s3/g) of the GC sample are improved greatly compared with the corresponding base glass. The maximum M2 value of the GC sample is ∼126 times greater than that of fused silica and ∼1.6 times greater than that of single-crystal germanium. A significant reduction in acoustic attenuation (5 dB/cm) is also observed. The micro-structural results indicated that, the precipitated Ga2Se3 crystal grains and the tetrahedral structure in the residual matrix glass jointly reduced the acoustic attenuation of the glass ceramics with a heat treatment time of 15 h and improved the thermomechanical performance. This work suggests that chalcogenide glass-ceramic can be a new type of promising infrared AO material.
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