Abstract
While widely used in the visible, radial gradient refractive index (GRIN) lenses are still elusive in the IR waveband. In this paper we introduce a new method based on spatially resolved crystallization of chalcogenide glass to produce such lenses. Optical and structural properties of 80 GeSe2–20 Ga2Se3 glass ceramic samples are measured. A shift of refractive index is induced by increasing the density of nanocrystals. By placing the sample into a tailored thermal profile, spatially controlled crystallization is achieved. To our knowledge this constitutes the first fabrication of an optically functional radial GRIN in the IR. We also introduce a method to characterize the index profile non-destructively, which is a necessary step for embedding GRIN into commercial systems.
Highlights
Gradient Refractive Index (GRIN) lenses are optics where the refractive index varies n spatially.[1]
We demonstrate the first fabrication of a radial GRIN for the IR using c 80 GeSe2 – 20 Ga2Se3 glass composition, by spatially resolved crystallization. c2
In order to validate that this material is relevant for a GRIN application, the change in refractive index with the evolution of crystalline structure is characterized by annealing several samples of 80 GeSe2–20 Ga2Se3 base glass at 390 °C in a ventilated furnace for a range of durations up to 72 h
Summary
Gradient Refractive Index (GRIN) lenses are optics where the refractive index varies n spatially.[1]. Radial Gradient Refractive Index (GRIN) infrared lens based on spatially resolved crystallization of chalcogenide glass
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