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Photorefractive Properties of Co‐Doped Potassium Sodium Strontium Barium Niobate Crystals
Author(s) -
Xia H.R.,
Zou J.H.,
Chen H.C.,
Sun D.L.
Publication year - 1999
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/(sici)1521-4079(199903)34:3<403::aid-crat403>3.0.co;2-9
Subject(s) - photorefractive effect , strontium barium niobate , potassium niobate , grating , materials science , doping , strontium , barium , optics , sodium , ferroelectricity , optoelectronics , chemistry , dielectric , physics , organic chemistry , metallurgy
The transmissivity and the results of two‐beam coupling and self‐pumped phase conjugation (SPPC) experiments on Co‐doped potassium sodium strontium barium niobate (KNSBN) single crystals are reported. The Co ions doped into KNSBN can form a deep energy level near 2.25 eV. The two‐beam coupling gain coefficients of the Co‐doped KNSBN are nearly 20 cm ‐1 at 2 teta = 37 0 for the transmission photorefractive index grating and larger than 29.2 cm ‐1 for the reflecting photorefractive index grating. A striking single‐beam asymmetric transmission was observed. The maximum SPPC reflectivity is larger than 70% at teta = 49.7 0 for an intensity W = 77 mW, which is the largest value measured in the family of KNSBN crystals.