Study of Ge-As-Se system with high refractive index for infrared glass molded lens

Seon Hoon Kim; Taeyeon Lee; Soyoung Kim; Karam Han; Jung-Hwan In; Doo Gun Kim; Ju Hyeon Choi

doi:10.1117/12.2632956

30 September 2022 Study of Ge-As-Se system with high refractive index for infrared glass molded lens

Seon Hoon Kim, Taeyeon Lee, Soyoung Kim, Karam Han, Jung-Hwan In, Doo Gun Kim, Ju Hyeon Choi

Proceedings Volume 12234, Infrared Sensors, Devices, and Applications XII; 122340F (2022) https://doi.org/10.1117/12.2632956
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Conference Poster

Abstract

For chalcogenide-based infrared glass materials, the need was emphasized along with the spread of thermal imaging cameras in COVID 19 environment. Commercial Ge-As-Se glass system exhibits a dispersion value of 100~180 and a refractive index of 2.5 or more, and is suitable for the glass molding process, so it is used as an aspherical infrared lens for various thermal imaging cameras. However, some compositions are not suitable for glass molding process. In this study, the composition of the long wavelength infrared glass melting was designed based on the Ge-As-Se system with a Ge composition range of 0~35 at%, As composition range of 20~40 at%, and Se composition range of 25~60 at%. As a result of XRD analysis for each Ge-As-Se-based composition, it was confirmed that all amorphous grains were obtained in the developed composition area. For the Ge-As-Se glass-forming composition region, the glass transition temperature ranged from 180 to 425°C. The refractive index was measured using the prism method in the 3 to 12 μm wavelength band. The refractive index (λ=10 μm) of Ge5As40Se55 and Ge5As35Se60 was 2.6913 and 2.6538, respectively. Moldability test was performed using a glass molding press. As a result of observing whether the lens has internal defects and microcracks after molding, it was confirmed that there was no abnormality and that it was suitable for glass molding process.

Citation Download Citation

Seon Hoon Kim, Taeyeon Lee, Soyoung Kim, Karam Han, Jung-Hwan In, Doo Gun Kim, and Ju Hyeon Choi "Study of Ge-As-Se system with high refractive index for infrared glass molded lens", Proc. SPIE 12234, Infrared Sensors, Devices, and Applications XII, 122340F (30 September 2022); https://doi.org/10.1117/12.2632956

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