Reduction in NIR absorption of spinel through annealing

Jeremy Murray-Krezan; Luke A. M. Lyle; Matthew Wells; William J. Everson; Joseph A. Randi; David J. Rearick; John J. Gannon Jr.; Mark V. Parish; Woohong Kim; Shyam Bayya; Tony Zhou; Jasbinder S. Sanghera

doi:10.1117/12.2664192

14 June 2023 Reduction in NIR absorption of spinel through annealing

Jeremy Murray-Krezan, Luke A. M. Lyle, Matthew Wells, William J. Everson, Joseph A. Randi, David J. Rearick, John J. Gannon Jr., Mark V. Parish, Woohong Kim, Shyam Bayya, Tony Zhou, Jasbinder S. Sanghera

Author Affiliations +

Proceedings Volume 12530, Advanced Optics for Imaging Applications: UV through LWIR VIII; 125300E (2023) https://doi.org/10.1117/12.2664192
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

Transparent magnesium aluminate spinel (MgAl2O4) has been developed as an optical ceramic for a variety of applications, including as windows. As a broadband, ultraviolet (UV) thru midwave infrared (MIR) material, it has been developed for windows and has many desirable properties compared with alternative infrared glasses and other transparent ceramics. Current efforts to advance high strength spinel manufacturing processes have demonstrated progress toward large format windows. Although low-absorption spinel, specifically in the near-infrared (NIR) has been demonstrated previously, additional processing is required for new, large-scale spinel manufacturing processes to decrease the effects of impurities near one-micron wavelengths. In this work we present recent results that show measured absorption near 1 μm is reduced by annealing, which reduces effects of trace impurities. Experimental results from photo-thermal common-path interferometer measurements are reported.

Conference Presentation

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Jeremy Murray-Krezan, Luke A. M. Lyle, Matthew Wells, William J. Everson, Joseph A. Randi, David J. Rearick, John J. Gannon Jr., Mark V. Parish, Woohong Kim, Shyam Bayya, Tony Zhou, and Jasbinder S. Sanghera "Reduction in NIR absorption of spinel through annealing", Proc. SPIE 12530, Advanced Optics for Imaging Applications: UV through LWIR VIII, 125300E (14 June 2023); https://doi.org/10.1117/12.2664192

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