Scientists successfully print glass optics

  Science & technology

A new 3D-printing technique, developed at Lawrence Livermore, could allow scientists to print glass that incorporates different refractive indices in a single flat optic, making finishing cheaper and easier.

3dprintedoptics
Researchers at Lawrence Livermore National Laboratory have successfully 3-D printed optical quality glasses
For the first time, researchers at Lawrence Livermore National Laboratory (LLNL) have successfully 3-D-printed optical-quality glasses, on par with commercial glass products currently available on the market.
In a recently-published study, LLNL scientists and engineers describe successfully printing small test pieces from Lab-developed ink with properties "within range of commercial optical grade glasses."
Because the refractive index of glass is sensitive to its thermal history, it can be difficult to ensure that glass printed from the molten phase will result in the desired optical performance, researchers said. Depositing the LLNL-developed material in paste form and then heating the entire print to form the glass allows for a uniform refractive index, eliminating optical distortion that would degrade the optic's function.
"Components printed from molten glass often show texture from the 3-D-printing process, and even if you were to polish the surface, you would still see evidence of the printing process within the bulk material," said LLNL chemical engineer Rebecca Dylla-Spears, the project's principal investigator. "This approach allows us to obtain the index homogeneity that is needed for optics. Now we can take these components and do something interesting."
The custom inks, aimed at forming silica and silica-titania glasses, allow researchers the ability to tune the glass's optical, thermal and mechanical properties, Dylla-Spears said. For the study, researchers printed...
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