90°-prism retroreflector PR in test cell.
Optical setup for the holographic refractometer: BTO, Bi12TiO20 crystal; BS, beam splitter; M1 and M2, mirrors; P1 and P2, polarizers; L1 to L3, lenses; translation stage TS driver, CCD camera and PC computer for image acquisition.
(a) and (b) Pictures of the refractometer prototype; (c) PR mount and test cell.
Contour holographic interferogram of the tilted metallic plate for four laser modes and λ S = 6.6284 mm.
Refractive index of the mixture ethanol + water as a function of the ethanol mass fraction, measured with the holographic refractometer (circles) and by a commercial Abbe refractometer (triangles).
Refractive index of the aqueous NaCl solution vs the NaCl concentration, measured with the holographic refractometer (circles) and with the Abbe refractometer (triangles). The solid curve refers as to the data obtained from Eq. (4).
Optical arrangement for two-laser holographic refractometry.
Two-laser holographic interferogram of the flat object for λ S = 788.8 ± 0.5 μm.
(a) and (b) Optical schemes on the reference-beam arm for effective ΔL enlargement. M3 and M4, mirrors, PR1, PR2, and PR3, 90°-prisms.
Measurement of NaCl concentrations in an aqueous solution by refractometry. C SNaCl are the known concentrations (first column) and C SH (third column) and C SA (sixth column) are the NaCl concentrations obtained through the holographic and the Abbe refractometers, respectively.
Article metrics loading...
Full text loading...