On Thursday, August 8th, the UR SPIE student chapter will be continuing its annual Summer Colloquium series.
Who: Anthony Visconti
What: Design and Fabrication of Large Diameter Radial Gradient-Index Lenses for Dual-Band Visible to Short-Wave Infrared Imaging Applications
Date: 08/08/2013
Time: 11:30 am – 12:30 pm
Where: Sloan Auditorium (Goergen 101)
Abstract: The lack of fabrication methods to produce large diameter (>20 mm) radial gradients has historically restricted their use in commercial optical systems. Ion exchange is a well-known process used in the chemical strengthening of glass and the fabrication of waveguide devices and small diameter (<4 mm) gradient-index (GRIN) optical relay systems. The technique is relatively straightforward to implement and therefore attractive for GRIN fabrication; however, the manufacturing of large-diameter radial gradients with ion exchange is limited by long diffusion times.
Materials research presented in this work aims to characterize the manufacturing process of a fast-diffusing titania silicate glass in both Li+ for Na+ and Na+ for Li+ ion exchanges. Manufacturing challenges associated with diffusion in titania silicate glass are addressed in order to extend its manufacturability to large diameter (15 – 20 mm) radial diffusions.
Additionally, a polychromatic GRIN design model is utilized to illustrate the potential usefulness of GRIN elements in dual-band visible to shortwave infrared (vis-SWIR) imaging applications. Color correction in the vis-SWIR using standard optical materials proves quite difficult especially over large temperature ranges. The benefits of radial GRIN elements in color correction of broadband vis-SWIR imaging applications stems from the unique dispersion properties of the material.
Bring your lunch! Snacks and beverages will be provided.
