Presentation + Paper
27 May 2022 Temperature-dependent UV transparency of ultra-low expansion ULE glass
Jue Wang, Michael J. Campion
Author Affiliations +
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
© (2022) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Glasses

Transmittance

Ultraviolet radiation

Absorption

Refractive index

Data modeling

UV optics

RELATED CONTENT

Optical materials for blue-laser processing
Proceedings of SPIE (August 01 2021)
Optical properties of diamond
Proceedings of SPIE (September 28 1994)

Back to Top