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Optical properties of the germanate melilites Sr 2 MgGe 2 O 7 , Sr 2 ZnGe 2 O 7 and Ba 2 ZnGe 2 O 7
Author(s) -
Becker P.,
Held P.,
Liebertz J.,
Bohatý L.
Publication year - 2009
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200900179
Subject(s) - melilite , tetragonal crystal system , analytical chemistry (journal) , germanate , refractive index , phase (matter) , chemistry , materials science , crystal structure , mineralogy , crystallography , doping , optoelectronics , organic chemistry , chromatography , metallurgy , spinel
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. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)