Using small angles between the wave vectors of the incident and scattered photons it is possible to observe Raman scattering by phonons or polaritons with small wave vectors which are determined by the momentum conservation equation. The photon wave vector inside a crystal with the refractive index n is k = 2 Jin/A where X is the wave length in vacuum. In uniaxial crystals there are an ordinary...

Validation of a modified four-parameter model describing temperature effect on liquid crystal refractive indices is being reported in the present article. This model is based upon the Vuks equation. Experimental data of ordinary and extraordinary refractive indices for two liquid crystal samples MLC-9200-000 and MLC-6608 are used to validate the above-mentioned theoretical model. Using these ex...

LiTbF4 has the potential to replace traditional magneto-optic garnet materials as a Faraday rotator in high power laser systems due to its high Verdet constant. New measurements are reported of the ordinary and extraordinary refractive indices of LiTbF4 as functions of wavelength and temperature, respectively, as well as their corresponding Sellmeier expressions. Consequently, the Verdet coeffi...

We have shown that the optical sign of uniaxial langasite crystal Ca 3 TaAl Si 2 O 14 is positive. also measured phase-matching conditions second-harmonic generation and sum-frequency up to 3.5 µm. Simultaneous fitting these experimental data allowed us report Sellmeier equations ordinary extraordinary principal refractive indices, magnitude nonlinear coefficient.

[1] Recent progress in high‐precision GPS measurements research and applications leads to the study of higher‐order ionosphere effects on GPS signal propagation. This paper focuses on second‐order ionospheric effects, which are influenced by the presence of the Earth’s magnetic field. Due to the presence of Earth’s magnetic field, GPS signals may propagate through the ionosphere in two distinct...

Refractive indices for the crystals potassium dihydgrogen phosphate, potassium titanyl phosphate and potassium niobate are measured. Samples of KDP from different crystal growers had slightly different refractive indices. The refractive indices of KDP for ordinary rays are studied as a function of temperature. The temperature coefficient of the refractive indices has little dependence on the wa...

2014 The refractive indices of two nematogens, 4-methoxy-benzylidene-4’-n-butylaniline (MBBA) and 4-n-pentyl-4’-cyanobiphenyl (5CB), have been measured throughout their nematic ranges at pressures up to 2 kbar and temperatures up to 70 °C in the first substance and up to 5 kbar and 145 °C in the second. Measurements were made at 03BB = 5 890 Å, using a sensitive interference fringe technique. R...

Planar optical waveguides have been formed in strontium barium niobate single crystals by either proton or heliumion implantation. The profiles of the ordinary and the extraordinary refractive indices are deduced from dark-line mode spectroscopy. Optical barriers with depths to Deltan(e) = 2.6% for protons and Deltan(e) = 5.5% for helium are obtained. By proton implantation we find a very low i...

Anomalous spectral shift of transmission peaks is observed in a Fabry-Pérot cavity filled with a chiral anisotropic medium. The effective refractive index value resides out of the interval between the ordinary and the extraordinary refractive indices. The spectral shift is explained by contribution of a geometric phase. The problem is solved analytically using the approximate Jones matrix metho...

We have examined the properties of low-frequency electromagnetic waves in multicomponent ionospheric plasma 1–30 Hz band, using magnetoionic theory. Complex permittivity tensor components and refractive indices normal (ordinary extraordinary) were calculated at altitudes from 80 to 750 km. The calculations show that are highly dependent on frequency height. Polarization ordinary extraordinary i...