Abstract
Gradient refractive index (GRIN) lenses are an excellent solution for multispectral imaging. Here, we present a method to establish a series of gradient glasses with large refractive index differences (Δn) as well as similar thermal properties (glass transition temperature, Tg). A series of selenium-based gradient glasses were developed by tailoring the Ge-As-Se composition and external doping with different amounts of silver. These sulfur-free and tellurium-free selenium-based glasses cover an ultra-wide high transmission spectrum from 0.8 to 15 μm and possess a large Δn of 0.23 and a small Tg difference of 9 °C. These gradient glasses also exhibit excellent refractive index linearity. The evolution pattern of the glass network structure and its corresponding properties are analyzed in detail with the variation of the composition.
Published Version
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