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The Supplementary Comparison COOMET.PR-S3 was carried out to ensure the correctness and comparability of refractive index of solid transparent materials in visible spectral range measured by the participants of the comparison within the uncertainties claimed for their measuring facility. COOMET.PR-S3 was conducted within the Regional Metrology Organization (RMO) "Euro-Asian Cooperation of National Metrological Institutions" known as COOMET, and has the RMO project number of 438/RU/08. The Comparison was piloted by the All-Russian Research Institute for Optical and Physical Measurements (VNIIOFI). Five NMIs from three RMOs (COOMET, EURAMET and APMP) participated in the comparison. This report describes the measurement results of three prismatic samples made of different types of glass. Three participants, VNIIOFI, PTB and Ukrmetrteststandart have made measurements of the refractive index at the wavelengths of 480 nm, 509 nm, 546 nm, 589.3 nm, 644 nm, and three participants, VNIIOFI, INRiM and AIST at the wavelength of 632.8 nm. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCPR, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

We present a new approach to optical tomography of phase objects that is referred to as differential interference contrast tomography (DICT). The main feature of DICT is that the result of tomographic reconstruction is a 3D DIC image. This image is described by partial derivative of 3D refractive index distribution in one direction. The DICT setup consists of a lateral shearing phase-shifting interference microscope with low-coherent LED illumination. To create projections of the sample at various illumination angles, an angular scanning beam was used. 3D DIC tomograms of a white blood cell are presented. The comparison between the reconstructed DIC tomogram slices and the conventional DIC images of the same sample at the same depths are also represented.