The full vectorial finite difference beam propagation method is used for modelling light propagation in photonic crystal fibre. We have simulated light propagation in 10 mm long fibre with the structure consisting of an air-filled silica and characterised by triangular lattice of air holes with a pitch Λ = 2μm and with the central high refractive index defect acting as a core. Both the index guiding and photonic band gap effect guiding are considered. The computed wave field is discussed and compared with the results of other authors.
The investigations of the Raman scattering spectra of the KDy(WO4)2 single crystals have shown that the phase transitions found at 6.38 K exhibit the peculiarities characteristic of SPT Jahn-Teller type. The paper presents also the results of IR absorption investigations of the ADy(WO4)2 single crystals, where A equals K, Rb.
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