Synthesis and characterization of large optical grade sapphire windows produced from a horizontal growth process

摘要

As sensor technology and applications have advanced over the years, the size of sensor windows has grown substantially to satisfy current and future demands. Rubicon Technology, with their strong history in scaling sapphire crystal growth and large scale production processes, has successfully produced large sapphire blanks using a highly modified horizontal directional solidification process. Several prototypes have been synthesized up to 1.75 inches thick, 14 inches wide and 20 inches long. Crystal properties and optical characteristics such as transmission and refractive index homogeneity will be presented on several polished bubble-free windows with excellent results. This research sets the standard for high quality monolithic sapphire sheets large enough for use as seamless integrated optical windows in both military and civilian applications.