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Proceedings Paper

An alternative method for measuring the index profile of a gradient-index lens
Author(s): H. C. Hsieh; W. C. Wu; W. Y. Chang; F. S. Hsu; D. C. Su
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Paper Abstract

An alternative method for measuring the index profile of the GRIN lens is proposed based on Fresnel's equations and the common-path phase-shifting interfermetry. A light beam composing of the right- and the left- circularly polarized components is obliquely incident on the tested GRIN lens and the reflected light passes through an analyzer. The light is collected and imaged by an imaging lens to a CMOS camera. Four interferograms under different additional phases are taken and Carre's phase-shifting method is used to calculate the full-field phase distribution. Next, the estimated data are substituted into the special equations derived from the Fresnel's equations, and the index profile of the GRIN lens can be obtained. Its validity has been demonstrated. It has both merits of the common-path interferemetry and the phase-shifting interferemetry.

Paper Details

Date Published: 2 November 2011
PDF: 7 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80116R (2 November 2011); doi: 10.1117/12.901524
Show Author Affiliations
H. C. Hsieh, National Chiao-Tung Univ. (Taiwan)
W. C. Wu, National Chiao-Tung Univ. (Taiwan)
W. Y. Chang, National Chiao-Tung Univ. (Taiwan)
F. S. Hsu, National Chiao-Tung Univ. (Taiwan)
D. C. Su, National Chiao-Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World
Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Rufino Díaz-Uribe; Rufino Díaz-Uribe; Rufino Díaz-Uribe, Editor(s)

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