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, Mark V. Parish, Woohong Kim, Shyam Bayya, Tony Zhou, Jasbinder S. Sanghera

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationAdvanced Optics for Imaging Applications
Subtitle of host publicationUV through LWIR VIII
EditorsJay N. Vizgaitis, Peter L. Marasco, Jasbinder S. Sanghera
ISBN (Electronic)9781510661745
StatePublished - 2023
EventAdvanced Optics for Imaging Applications: UV through LWIR VIII 2023 - Orlando, United States
Duration: May 1 2023 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdvanced Optics for Imaging Applications: UV through LWIR VIII 2023
Country/TerritoryUnited States
Period5/1/23 → …

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this