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Abstract
Absorption measurements of Sr0.61Ba0.39Nb2O6:Ce under visible light (Ar+, -Kr+ laser or XBO-lamp) illumination show a light-induced broadband NIR-absorption with maximum at 1.6 μm. This absorption is very pronounced at temperatures below 150 K. Its lineshape is similiar to the broadband absorption which is being observed in reduced SBN crystals. The time dependence of the light induced NIR-absorption after switching off the laser light can be fitted by an addition of two exponentials. The temperature dependence of these time constants is not Arrhenius like indicating several interaction mechanisms.