Refractive index and dispersion measurement using low-coherence interferometry with broadband confocal scanning

Daniel Francis; Helen D. Ford; Ralph P. Tatam

doi:10.1117/12.2306391

9 May 2018 Refractive index and dispersion measurement using low-coherence interferometry with broadband confocal scanning

Daniel Francis, Helen D. Ford, Ralph P. Tatam

Author Affiliations +

Proceedings Volume 10680, Optical Sensing and Detection V; 106801I (2018) https://doi.org/10.1117/12.2306391
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

Measurement of the refractive index and thickness of transparent plates is demonstrated using combined low-coherence interferometry and confocal scanning. The low-coherence measurement provides a quantity related to the group index and the confocal scan provides a parameter related to the phase index. Calculation of both the phase and group indices also requires a measurement of the confocal parameter at multiple wavelengths. This is achieved using a broadband source and a line-scan spectrometer to interrogate different regions of the spectrum. Measurements are made on a range of transparent optical materials with the mean percentage errors of each measurand being 0.08%, 0.06%, and 0.12% for n_p, n_g, and thickness t respectively.

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Daniel Francis, Helen D. Ford, and Ralph P. Tatam "Refractive index and dispersion measurement using low-coherence interferometry with broadband confocal scanning", Proc. SPIE 10680, Optical Sensing and Detection V, 106801I (9 May 2018); https://doi.org/10.1117/12.2306391

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