Infrared GRIN GeS₂–Sb₂S₃–CsCl chalcogenide glass–ceramics

Abstract

Chalcogenide glasses show a unique potential for creating gradient refractive index (GRIN) lenses, which would reduce the size and weight of infrared thermal imaging system and remain/improve its performance. Here, we propose a new method that forms a GRIN chalcogenide glass-ceramics (GCs) by creating low refractive index (n) CsCl nanocrystals within a high n GeS 2 -Sb 2 S 3 glass matrix. After specific gradient thermal treatment, the GRIN structure of Δn ∼ 0.04 was formed through the gradient precipitation of CsCl. This work would pave a new path to design the GRIN chalcogenide GCs through a selective crystallization of halide crystals with low n.

Thermally matched chalcogenide glasses with high refractive index contrast for infrared graded‐index lenses

“…[11][12][13] Benefiting from the excellent rheological property, adjustable composition and refractive index, and controllable crystallization of some chalcogenide glasses, they have been considered to be good base materials for GRIN lenses. To date, researchers have tried to prepare infrared GRIN lenses by several techniques such as laser-induced vitrification, 14 controllable crystallization, [15][16][17] stacking diffusion, 18,19 and ion exchange. 13 Compared with other preparation techniques, the stacking diffusion method is more universal.…”

Modification of free-volume defects in the GaS2–Ga2S3–CsCl glasses

“…Significant successes in this field are associated with the possibility of chemical-technological modification of elements based on chalcogenide glasses GeS 2 -Ga 2 S 3 through components that give new properties [7][8][9][10][11]. Thus, the basic functionality of glasses can be effectively combined with the high transparency of halides in the visible part of the spectrum, creating mixed chalcogenide-halide glasses [12][13][14][15]. The combination of optical properties with flexibility in the choice of composition and synthesis technology makes it indispensable in photonics.…”