In this work thermal lens spectrometry is applied to determine the temperature coefficient of optical path length in several optical materials. Polymer, fluoride and low silica calcium aluminosilicate glasses and YAG, YVO4, YLF, LiSAF, and LiSGaF crystals were analyzed. The results showed the ability of the thermal lens method to obtain the absolute values of this so important optical parameter, which is crucial for those who work in the designing of solid state laser cavity.
Dispersion of the principal refractive indices of pure and Yb(3+) (20 at.%)-doped KY(WO(4))(2) crystal is obtained in the visible range of the spectrum. A comparatively strong increase of the refractive indices (0.005-0.007) was observed for the doped crystal. Temperature dependence of the principal refractive indices is measured in the temperature region of 290-690 K. Thermo-optical coefficients (TOCs) of the first dn/dt and the second (1/2)(d(2)n/dT(2)) order are determined. It is found that TOCs are negative for n(p) and n(g) and positive for n(m) in both crystals. Doping increases dn(p)/dT almost two times more in comparison to that of the pure crystal, while for the other two indices TOC changes are insignificant.
CuGa 5 Te 8 single crystals were grown by the Bridgman method, and their composition, melting point, and lattice parameter were determined. Near-edge transmission and reflection measurements in the range 10-300 K were used to determine the band gap of CuGa 5 Te 8 as a function of temperature.
Growth and Morphology of the CuGaS,, CuAlSe,, CuGaSe, and CuInS, Ternary Compounds Monocrystals of the ternary compounds CuGaS,, CuAlSe,, CuGaSe,, and CuInS, were grown from their elements by transport reactions; their cell parameters and melting temperature were determined. The character of the phase transition in these compounds was found out and also the boundary conditions of growing the inonocrystals as well as their dislocation structure (by etching).
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