A method for measurement of refractive index profile of a GRIN system is developed based on a longitudinal interferometer using a birefringent lens (BL). The fringe pattern so generated is made to traverse through the sample under test. The modification of the fringes gives a measure of the refractive index profile. The fringe patterns both in presence and absence of the test samples are grabbed by a CCD camera and further processed by a computer. The basic software required for the same is being developed. Some experimental results are presented © 2001 SPIE · 0277-786X/01/$15.00.

M RAY

S K SARKAR

A BASURAY

N SOODBISWAS

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Measurement of refractive index profile of GRIN glasses

Proceedings of SPIE - The International Society for Optical Engineering

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. © 1996 Society of Photo-Optical Instrumentation Engineers.

Optical Engineering

Measurement of gradient refractive index profile using a birefringent lens

Applied Optics

Gradient-index optics: a review

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation

An interferometer for measuring gradients in both refractive index and thickness of large or small optics

Journal	Proceedings of SPIE - The International Society for Optical Engineering
Publisher	-
ISSN	0277-786X