A brief overview of currently available methods applied in laser synthesis of 3D parts is presented, which range from stereolithography making use of liquid photopolymers to selective laser sintering of metal powders aimed at production of the parts of complex topology.
The investigation of physical properties of new relaxor ferroelectric material of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystal has been carried out. It has been established the opportunity of existence of this crystal in two modifications, having tetragonal unit cell (space group P4mm) and cubic perovskite one (space group Pm3m) accordingly. Their lattice parameters were found. It has been established a thermal stability of the PMN-PT single crystals in wide temperature range (20-950°C). The results of optical investigations have shown, that the crystals have good transparency in wide spectral area from the visible to IR range. Dispersion of refractive index of PMN-PT crystal are calculated by the dispersion theory and Kramers-Kronig' relationship. Using interferometry method, extremely large linear electro-optic coefficients r13~33 pm/V and r33~80 pm/V were characterised for the crystal, having tetragonal unit cell. It has been discussed prospects of the material while creating different optical systems.
The parameters of anisotropy and gyrotropy area are shown to exist in biaxial gyrotropic crystals, where local sites of wave vectors surface in the vicinity of optical axis directions have negative or zero curvature. In these directions effects of focusing and diffractionless propagation of light beams occur. At Gaussian beams example a number of focusing and diffractionless propagation schemes are presented. The description of the new type of nondiffracting light beams (spatial solitons) in photorefractive crystals in the case of phase shifted diffraction gratings is given.
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