22 May 2015 Low-loss spinel windows for high-energy lasers
Author Affiliations +
Ideal exit aperture windows for high-energy laser (HEL) should possess low absorption and scattering losses and be environmentally rugged and strong in order to protect the laser gain medium without compromising the light propagating through the window. Spinel is an ideal candidate for this application due to its high mechanical strength, high thermal conductivity, and excellent optical transmission between 0.2~5 μm. However, spinel ceramics fabricated with commercial powders often show inhomogeneity and suffer from absorption and scattering caused by various types of intrinsic and extrinsic impurities present in the powders. Here, we report on a convenient and economical powder purification method to significantly lower the absorption loss of transparent spinel ceramics using commercial powders. Acid washing was successfully used to reduce absorption loss in spinel ceramic fabricated using commercial powder from >20,000 ppm/cm down to 75 ppm/cm.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Woohong Kim, Woohong Kim, Colin Baker, Colin Baker, Guillermo Villalobos, Guillermo Villalobos, Shyam Bayya, Shyam Bayya, Michael Hunt, Michael Hunt, Bryan Sadowski, Bryan Sadowski, Ishwar Aggarwal, Ishwar Aggarwal, Jasbinder Sanghera, Jasbinder Sanghera, "Low-loss spinel windows for high-energy lasers", Proc. SPIE 9453, Window and Dome Technologies and Materials XIV, 945303 (22 May 2015); doi: 10.1117/12.2176378; https://doi.org/10.1117/12.2176378


Back to Top