New interferometric method for measuring refractive index distribution in wedge-shaped GRIN blanks

Ludmila A. Gerasimova

doi:10.1117/12.216393

11 August 1995 New interferometric method for measuring refractive index distribution in wedge-shaped GRIN blanks

Ludmila A. Gerasimova

Proceedings Volume 2537, Novel Optical Systems Design and Optimization; (1995) https://doi.org/10.1117/12.216393
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A new interferometric method for measuring refractive index distribution in GRIN blanks with shapes deviating from plane-parallel ones is described. It uses a standard double-pass interferometric scheme modified to provide single passing of the beam through the investigated GRIN sample. Four interferograms recorded with one preliminary adjustment of the sample allow to restore the distribution of refractive index in the sample, eliminating errors introduced by imperfectness of the interferometer and of sample surfaces, and wedge shape of the sample. The method does not need information about the thickness and the wedge angle of a blank. Two-dimensional dependence of refractive index in transverse dimensions along the sample surface can be measured with the accuracy better than 1(DOT)10^-4.

Citation Download Citation

Ludmila A. Gerasimova "New interferometric method for measuring refractive index distribution in wedge-shaped GRIN blanks", Proc. SPIE 2537, Novel Optical Systems Design and Optimization, (11 August 1995); https://doi.org/10.1117/12.216393

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