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Proceedings Paper

Point diffraction interferometer for measurement of the refraction index of a glass plate
Author(s): E. Rueda-Soriano; F. S. Granados-Agustín; A. Cornejo-Rodríguez; Elizabeth Percino-Zacarías; P. Cebrian-Xochihuila; B. Canales Pacheco
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Paper Abstract

This work shows the measurement of the refraction index of a glass plate using a Point Diffraction Interferometer (PDI). The plate of the PDI has a micro-hole and transmittance of less than 10%. The experimental setup consists in a He-Ne laser illuminating a spatial filter, a collimated beam is produced by an achromatic lens, and close to the focal point of a second lens (focusing lens), the plate of the Point Diffraction Interferometer is located. When the laser light pass through the plate of the PDI, it is generated an interference reference pattern, called Ir, which is recorded. As a second step, a glass plate with unknown index refraction is introduced between the focusing lens and the plate of the PDI, obtaining a new modified interference pattern, called It. We use the geometrical of figure of interference fringe for analysis of the interferograms. Value of the refraction index of the glass plate, nt, can be derived, with the previous knowledge of the glass plate thickness. Some experimental results will be shown.

Paper Details

Date Published: 25 September 2012
PDF: 6 pages
Proc. SPIE 8494, Interferometry XVI: Applications, 84940J (25 September 2012); doi: 10.1117/12.928889
Show Author Affiliations
E. Rueda-Soriano, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
F. S. Granados-Agustín, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
A. Cornejo-Rodríguez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Elizabeth Percino-Zacarías, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
P. Cebrian-Xochihuila, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
B. Canales Pacheco, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)


Published in SPIE Proceedings Vol. 8494:
Interferometry XVI: Applications
Cosme Furlong; Christophe Gorecki; Erik L. Novak, Editor(s)

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