Accuracy of refractive index spectroscopy by broadband interferometry

•A deep analysis of measurement accuracy in dispersion measurement by RISBI is presented.•Both, refractive and group index measurement are evaluated.•Assessment of the different contribution of refractive and group refractive index uncertainty is carry out.•It is shown that uncertainties better than...

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Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2022-01, Vol.187, p.110225, Article 110225
Main Authors: Arosa, Yago, Damián Rodríguez-Fernández, Carlos, Doval, Alejandro, López Lago, Elena, de la Fuente, Raúl
Format: Article
Language:English
Subjects:
Accuracy
Broadband
Dispersion
Fused silica
Interferometry
Measurement
Parameter identification
Refractivity
Silicon dioxide
Spectral interferometry
Spectroscopy
Uncertainty
White light interferometry
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Summary:•A deep analysis of measurement accuracy in dispersion measurement by RISBI is presented.•Both, refractive and group index measurement are evaluated.•Assessment of the different contribution of refractive and group refractive index uncertainty is carry out.•It is shown that uncertainties better than 10−4 can be achieved. Uncertainties of refractive and group index in dispersion measurement by spectrally resolved white light interferometry are deeply analyzed. First, the contribution to uncertainty of the different parameters affecting both indices is identified. Afterwards, results are presented for a 1.5 mm thick fused silica sample over a broad spectral range, from 400 to 1000 nm, and the effects that mostly deteriorate the measurement accuracy are established. Finally, the different contributions are quadratically combined to determine the total uncertainty of the two indices.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2021.110225