Abstract
The shape, depth, and maximum change in refractive index profile are of the most important parameters to be controlled when de- veloping gradient refractive index (GRIN) lens blanks. Generally refrac- tive index profiles are measured by standard interferometers such as Mach-Zhender, Twyman, and Shearing interferometers. These methods generate a large amount of data and need rigorous computation. A new kind of deflectometery is reported that can measure a GRIN profile using the interference pattern generated by a birefringent lens. Results based on this method are presented for radial GRIN glasses developed by Ag 1 -Na 1 and Na 1 -Li 1 ion exchange in alkali aluminosilicate glasses. © 1996 Society of Photo-Optical Instrumentation Engineers. Subject terms: gradient refractive index profile; birefringent lens; deflectometry; fringes.
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