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Colour centre in YAG: Cr 3+ crystals
Author(s) -
Kvapil S.,
Kvapil Jirí,
Mánek B.,
Perner B.,
Sevastyanov B. K.,
Orekhova V. P.
Publication year - 1982
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.2170170215
Subject(s) - octahedron , czochralski method , absorption (acoustics) , materials science , atmosphere (unit) , crystallography , doping , analytical chemistry (journal) , absorption spectroscopy , chemistry , optics , crystal structure , optoelectronics , physics , composite material , chromatography , thermodynamics
YAG crystals doped with 0.01 wt% Cr were grown by Czochralski method using 98% Ar + 2% H 2 protective atmosphere. Four colour varieties of the crystals were prepared in the dependence of the Al 2 O 3 :Y 2 O 3 ratio in the melt and the sign of electrical potential above the melt level. New absorption bands were attributed to the O − centre (400 to 480 nm), F centre (357, 500, and 833 nm) or Cr 3+ at another site than octahedral (455, and 612 nm).