Scalable laser-written Ge-As-Pb-Se chalcogenide glass-ceramic films and the realization of infrared gradient refractive index elements

Myungkoo Kang; Teodor Malendevych; Gufan Yin; Ian B. Murray; Martin C. Richardson; Juejun Hu; Ilya Mingareev; Kathleen A. Richardson

doi:10.1117/12.2518771

14 May 2019 Scalable laser-written Ge-As-Pb-Se chalcogenide glass-ceramic films and the realization of infrared gradient refractive index elements

Myungkoo Kang, Teodor Malendevych, Gufan Yin, Ian B. Murray, Martin C. Richardson, Juejun Hu, Ilya Mingareev, Kathleen A. Richardson

Author Affiliations +

Proceedings Volume 10998, Advanced Optics for Imaging Applications: UV through LWIR IV; 109980E (2019) https://doi.org/10.1117/12.2518771
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

We demonstrate a scalable photo-thermal process which enables manufacturing of infrared (IR) transmissive glass-ceramic films with gradient refractive index (GRIN) profiles. Spatiallycontrolled laser 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. The density of the high index nanocrystals is shown to be controlled by the laser irradiation power, and the extent of fraction crystallized is controlled by post heat treatment time and temperature. Both of 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 GRIN functionality 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.

Conference Presentation

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Myungkoo Kang, Teodor Malendevych, Gufan Yin, Ian B. Murray, Martin C. Richardson, Juejun Hu, Ilya Mingareev, and Kathleen A. Richardson "Scalable laser-written Ge-As-Pb-Se chalcogenide glass-ceramic films and the realization of infrared gradient refractive index elements", Proc. SPIE 10998, Advanced Optics for Imaging Applications: UV through LWIR IV, 109980E (14 May 2019); https://doi.org/10.1117/12.2518771

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