Conventional and Synchrotron X-Ray Topography of Defects in the Core Region of SrLaGaO4

$SrLaGaO_4$ single crystals are perspective substrate materials for high temperature superconductors thin films, elements of thermal radiation receivers and other electronic devices. The defect structure of the Czochralski grown $SrLaGaO_4$ crystal was investigated by means of X-ray topography exploring both conventional and synchrotron sources. The crystal lattice defects in the core region of the crystal were investigated. The regular network of defects arranged in rows only in ⟨100⟩ direction was observed. Owing to high resolution of synchrotron radiation white beam back reflection topographs one can distinguish individual spots forming the lines of the rows. It can be supposed that these elongated rod-like volume defects are located in 100 lattice planes forming a kind of walls. They are built approximately of the same phase as crystal but crystallize at a different moment than a rest of the crystal due to the constitutional supercooling

Conventional and synchrotron X-ray topography of defects in core region of SrLaGaO4SrLaGaO_4

$SrLaGaO_4$ single crystals are perspective substrate materials for high temperature superconductors thin films, elements of thermal radiation receivers and other electronic devices. The defect structure of the Czochralski grown $SrLaGaO_4$ crystal was investigated by means of X-ray topography exploring both conventional and synchrotron sources. The crystal lattice defects in the core region of the crystal were investigated. The regular network of defects arranged in rows only in ⟨100⟩ direction was observed. Owing to high resolution of synchrotron radiation white beam back reflection topographs one can distinguish individual spots forming the lines of the rows. It can be supposed that these elongated rod-like volume defects are located in 100 lattice planes forming a kind of walls. They are built approximately of the same phase as crystal but crystallize at a different moment than a rest of the crystal due to the constitutional supercooling

Neodymium doped SrLaAlO4. A new promising crystal for laser application

Single crystals of neodymium doped SrLaAlO4 have been grown by the Czochralski method and investigated using the methods of optical spectroscopy. Absorption band centered at 806nm is particularly intense in this crystal and this feature seems to be advantageous for side pumping with GaAlAs laser diode bars. Available spectroscopic data indicate that excited states absorption might be of low importance in SrLaAlO4:Nd