C03C 4/0028 (2013.01)
A refractive index device and method of making it include obtaining a glass structure comprising a plurality of nucleation sites. The glass structure is formed from a glass composition that comprises a first chemical component and a second chemical component. A crystal of the second chemical component has a different second refractive index from a first refractive index of the first chemical component. Each nucleation site defines where a crystal of the second chemical component can be grown. The method includes causing crystals of the second chemical component to grow in situ at a set of the plurality of nucleation sites in order to produce a spatial gradient of a refractive index in the glass structure.
Lockheed Martin Corporation (Bethesda, MD, US) The Penn State Research Foundation (University Park, PA, US) Clemson University Research Foundation (Clemson, SC, US)