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Lifetime of small polarons in nominally pure, reduced LiNbO3

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The processes of optical dissociation and recombination of bipo- larons are investigated in congruently melting lithium niobate. Time-resolved and temperature-dependent measurements of the light-induced absorption in the blue, red and infrared spectral range after exposure to short, intense laser pulses ( = 532 nm) are performed and the lifetime of small free polarons is determined in undoped LiNbO3 at room temperature for the first time. A qualitative charge-transport model for dissociation of bipolarons and recombination of small polarons is developed on the basis of our findings.

© 2005 Optical Society of America

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