Abstract

Based on a multi-three-wave interaction model, we theoretically analyze the intense amplification competition between fanning noise and the signal beam in doped lithium niobate crystals. Our results show that the signal beam can be most effectively amplified for a specific value of the photovoltaic field because of the amplification competition between fanning noise and the signal beam. When the threshold effect of incident-light intensity for photorefractive light-induced scattering is taken into account in LiNbO3:Fe, M (M=Mg2+, Zn2+, In3+, Sc3+) crystals, the signal beam can be most effectively amplified for a specific pump intensity.

© 1999 Optical Society of America

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