RT Journal Article
T1 Refractive index measurements in absorbing media with white light spectral interferometry
A1 Arosa Lobato, Yago
A1 López Lago, María Elena
A1 Fuente Carballo, Raúl de la
AB White light spectral interferometry is applied to measure the refractive index in absorbing liquids in the spectral range of 400–1000 nm. We analyze the influence of absorption on the visibility of interferometric fringes and, accordingly, on the measurement of the refractive index. Further, we show that the refractive index in the absorption band can be retrieved by a two-step process. The procedure requires the use of two samples of different thickness, the thicker one to retrieve the refractive index in the transparent region and the thinnest to obtain the data in the absorption region. First, the refractive index values are retrieved with good accuracy in the transparent region of the material for 1-mm-thick samples. Second, these refractive index values serve also to precisely calculate the thickness of a thinner sample (~150 µm) since the accuracy of the methods depends strongly on the thickness of the sample. Finally, the refractive index is recovered for the entire spectral range
PB OSA Publishing
SN 1094-4087
YR 2018
FD 2018
LK http://hdl.handle.net/10347/17634
UL http://hdl.handle.net/10347/17634
LA eng
NO Arosa, Y., Lago, E., & de la Fuente, R. (2018). Refractive index measurements in absorbing media with white light spectral interferometry. Optics Express, 26(6), 7578. doi: 10.1364/oe.26.007578
NO Ministerio de Economía y Competitividad (MINECO) (MAT2014-57943-C3-2-P, MAT2017-89239-C2-1-P); Xunta de Galicia and ERDF (AGRU 2015/11, GRC ED431C 2016/001 and ED431D 2017/06)
DS Minerva
RD 3 may 2026