Temperature-dependent UV transparency of ultra-low expansion ULE glass

Jue Wang; Michael J. Campion

doi:10.1117/12.2625810

27 May 2022 Temperature-dependent UV transparency of ultra-low expansion ULE glass

Jue Wang, Michael J. Campion

Proceedings Volume 12103, Advanced Optics for Imaging Applications: UV through LWIR VII; 121030I (2022) https://doi.org/10.1117/12.2625810
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

Optical properties of ULE® 7973 were assessed by using spectrophotometers and variable angle spectroscopic ellipsometer, indicating that ULE® 7973 is highly transmissive beyond the visible. The transparency is terminated by two fundamental absorption edges in the UV and middle-wave IR (MWIR). The UV and MWIR absorption edges are dominated by the titania and the silica constituents, respectively. We associated UV cut-off wavelength with optical bandgap and derived the optical dispersion by modeling both the spectral transmission and the ellipsometric data. The exponential absorption tail, the Urbach energy, in the UV increases linearly with temperature ranging from room temperature to 650 °C, whereas the optical bandgap decreases linearly over the same temperature range. Temperaturedependent coefficient is 18 μeV/°C for the Urbach energy, and - 0.7 meV/°C for the optical bandgap. The results indicate that the ULE® 7973 is a thermally stable refractive optical glass which maintains a broad spectral transparency even at elevated temperatures.

Conference Presentation

Citation Download Citation

Jue Wang and Michael J. Campion "Temperature-dependent UV transparency of ultra-low expansion ULE glass", Proc. SPIE 12103, Advanced Optics for Imaging Applications: UV through LWIR VII, 121030I (27 May 2022); https://doi.org/10.1117/12.2625810

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