The promising non linear optic single crystals Ca9Ln(VO4)7 (Ln – Y, La, Gd) have been grown by the Czochralski method
The promising non linear optic single crystals Ca9Ln(VO4)7 (Ln – Y, La, Gd) have been grown by the Czochralski method. The deviation from Ca/Ln stoichiometric ratio in the crystals was observed. The magnitude of deviation is increasing from Y to Gd.
The typical growth defects forming during crystal growth are region enriched by Ln element. It leads to a strong scattering of laser beam. The REM image of Ca9Gd(VO4)7 crystal surface presented in Fig.2. Bright regions have higher Zeff. Typical size of defective region enriched by Gd is d 5-10μm.
Now the technology of production of homogeneous composition Ca9Ln(VO4)7 (Ln – Y, La, Gd) crystals is under developing.
The typical growth defects forming during crystal growth are region enriched by Ln element. It leads to a strong scattering of laser beam. The REM image of Ca9Gd(VO4)7 crystal surface presented in Fig.2. Bright regions have higher Zeff. Typical size of defective region enriched by Gd is d 5-10μm.
Now the technology of production of homogeneous composition Ca9Ln(VO4)7 (Ln – Y, La, Gd) crystals is under developing.
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| Fig.1. Single crystal Ca9Y(VO4)7. | Fig.2. REM image of Ca9Gd(VO4)7 crystal surface (reflected electrone mode). |
