Open AccessA STUDY ON THE GAIN COEFFICIENT OF TWO WAVE COUPLING IN DOPED KNSBN CRYSTALS
Author(s) -
ZHU DE-RUI,
WANG REN,
谭健华 Tan Jianhua,
MO DANG
Publication year - 1992
Publication title -
acta physica sinica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.1440
Subject(s) - materials science , optics , coupling coefficient of resonators , coupling (piping) , doping , intensity (physics) , photorefractive effect , refractive index , physics , optoelectronics , resonator , metallurgy
Two wave coupling experiments of doped KNSBN single crystals have been performed. The gain coefficient of two wave coupling Γ as a function of the crossing angle of the beam 2θ, and Γ as a function of the intensity of light / in various samples were measured. The effective photo-refractive charge density, the effective electro-optic coefficient and the hole-electron competition factor have been determined by model fitting. The analytical expression of the intensity-dependent gain coefficient is deduced. We use this expression to analyse the experiment data of Γ-I. Our result shows that high values of Γ(>15 cm-1) exist in some kinds of doped KNSBN crystals.