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Optical properties of the germanate melilites Sr2MgGe2O7, Sr2ZnGe2O7 and Ba2ZnGe2O7

✍ Scribed by P. Becker; P. Held; J. Liebertz; L. Bohatý

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
365 KB
Volume
44
Category
Article
ISSN
0232-1300

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✦ Synopsis

Refractive indices and their dispersion in the wavelength range from 365 nm to 2325 nm and transmission ranges of the tetragonal melilite-type germanates Sr 2 MgGe 2 O 7 , Sr 2 ZnGe 2 O 7 and Ba 2 ZnGe 2 O 7 were determined. The uniaxial positive crystals Sr 2 MgGe 2 O 7 and Ba 2 ZnGe 2 O 7 both offer the possibility for phase matched second harmonic generation, a detailed analysis of phase matching conditions is given. The refractive indices of Sr 2 ZnGe 2 O 7 show an isoindex (isotropic) point at 467 nm. The investigation was performed on Czochralski grown large single crystals. The crystal structure of all three germanates were determined by means of X-ray diffraction. The results corroborate unmodulated melilite-type structures at room temperature.

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