We demonstrate a scalable photo-thermal process which enables manufacturing of infrared(IR) transmissive glass-ceramic films with gradient refractive index (GRIN) profiles. Spatiallycontrolledlaser irradiation creates Pb-rich amorphous phases within Ge-As-Pb-Se glass films,which are subsequently crystallized and become high index phases upon heat treatment. Thedensity of the high index nanocrystals is shown to be controlled by the laser irradiation power, andthe extent of fraction crystallized is controlled by post heat treatment time and temperature. Bothof these variables can be optimized to realize a localized effective refractive index change,enabling a spatially-modulated refractive index change up to ～ +0.1. We demonstrate IR GRINfunctionality within 1 inch diameter GAP-Se films with thicknesses ranging from 1 to 40 μm,confirming the scalability of our photo-thermal process to component-relevant geometries.
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