Point diffraction interferometer for measurement of the refraction index of a glass plate

E. Rueda-Soriano; F. S. Granados-Agustín; A. Cornejo-Rodríguez; Elizabeth Percino-Zacarías; P. Cebrian-Xochihuila; B. Canales Pacheco

doi:10.1117/12.928889

25 September 2012 Point diffraction interferometer for measurement of the refraction index of a glass plate

E. Rueda-Soriano, F. S. Granados-Agustín, A. Cornejo-Rodríguez, Elizabeth Percino-Zacarías, P. Cebrian-Xochihuila, B. Canales Pacheco

Author Affiliations +

Proceedings Volume 8494, Interferometry XVI: Applications; 84940J (2012) https://doi.org/10.1117/12.928889
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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 I_r, 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 I_t. We use the geometrical of figure of interference fringe for analysis of the interferograms. Value of the refraction index of the glass plate, n_t, can be derived, with the previous knowledge of the glass plate thickness. Some experimental results will be shown.

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E. Rueda-Soriano, F. S. Granados-Agustín, A. Cornejo-Rodríguez, Elizabeth Percino-Zacarías, P. Cebrian-Xochihuila, and B. Canales Pacheco "Point diffraction interferometer for measurement of the refraction index of a glass plate", Proc. SPIE 8494, Interferometry XVI: Applications, 84940J (25 September 2012); https://doi.org/10.1117/12.928889

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KEYWORDS

Glasses

Refractive index

Point diffraction interferometers

Wavefronts

CCD cameras

Helium neon lasers

Interferometers

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