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Optical Engineering

Measurement of gradient refractive index profile using a birefringent lens
Author(s): Nisha S. Biswas; Samir Kumar Sarkar; Amitabha Basuray
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Paper Abstract

The shape, depth, and maximum change in refractive index profile are of the most important parameters to be controlled when developing gradient refractive index (GRIN) lens blanks. Generally refractive 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+-Na+ and Na+-Li+ ion exchange in alkali aluminosilicate glasses.

Paper Details

Date Published: 1 February 1996
PDF: 6 pages
Opt. Eng. 35(2) doi: 10.1117/1.600917
Published in: Optical Engineering Volume 35, Issue 2
Show Author Affiliations
Nisha S. Biswas, Central Glass and Ceramic Research Institute (India)
Samir Kumar Sarkar, Univ. of Calcutta (India)
Amitabha Basuray, Calcutta Univ. (India)

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