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Growth of large doped Bi 12 SiO 20 crystals
Author(s) -
Gospodinov M.,
Doshkova D.
Publication year - 1994
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.2170290502
Subject(s) - dopant , analytical chemistry (journal) , stoichiometry , doping , absorption (acoustics) , attenuation coefficient , absorption spectroscopy , materials science , crystal (programming language) , mineralogy , chemistry , optics , physics , optoelectronics , chromatography , composite material , computer science , programming language
The conditions for growing Cr‐, Mn‐, Fe‐, Co‐, Ni‐, and Cr + Al‐doped BSO crystals from a stoichiometric melt by the Czochralski method have been the subject of research. A decrease of the absorption coefficient along the growth axis was observed in undoped crystals of 50 mm diameter and 150 mm long, which is indicative of melt stoichiometry change in the course of the growth run. The transmission and reflection spectra of different crystals were measured and the absorption coefficients was determined in the range 0.38–0.70 μm. When Fe dopant concentration exceeds a limit value, the absorption spectrum is blue‐shifted relative to the undoped case and the absorption coefficient decreases. Co, Cr, Mn, and Cr + Al dopants produce a red shift and increase the absorption coefficient. Combined Cr + Al doping shift the absorption spectrum to the blue region as compared to Cr‐only doping with the same Cr concentration.