Refractive index measurement by prism autocollimation

Abstract

An autocollimation-based method for measuring the refractive indices of solid or liquids using a Littrow prism is presented. Measurement accuracy is enhanced by use of a telescope. In solids, the refractive index is accurate to three decimal places. Similar accuracy is obtained in liquids by correcting for the wedge angle of the liquid container window. The proposed prismatic method confers high accuracy, compactness, and automation. It is suitable for index measurement applications in undergraduate laboratories.

Characterization of PbO-B2O3-GeO2-La2O3 and PbO-B2O3-SiO2-ZnO glasses: refractive, acoustic, photo-elastic and acousto-optic properties

“…Another technique applied to measure the refractive indices is a refractometric method, which is based on a Littrow prism arranged under condition of autocollimation [13][14][15][16]. The simplicity of optics inherent to this technique and the measurement accuracy achieved are comparable to those of a commonly known minimum-deviation method.…”

Plasmonic Metal/Semiconductor Heterostructure for Visible Light-Enhanced H2 Production

“…The geometry was created using the radius of a 12.5 nm silver nanosphere over a 50 nm × 50 nm Bi 2 WO 6 substrate. The work permittivity of silver was set to −15.243 -i0.40284 in our simulation, while the refractive indexes of air and Bi 2 WO 6 were set to 1 and 2.17, respectively. , For the simulation, a periodic boundary condition was used and the TM-polarized light wave was incident on the silver nanosphere.…”

Refractive Index Measurement of Pharmaceutical Solids: A Review of Measurement Methods and Pharmaceutical Applications

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