Abstract

Nickel-doped potassium niobate crystals show strong photorefraction in the near-infrared wavelengths from 700 to 800 nm. Two-wave mixing gain coefficients as high as 9 ${\text{cm}}^{-1}$ are obtained with the c-face entrance geometry. A very long dark decay time ($>1$ year) is observed in this wavelength range, which is of interest for optical storage applications that use diode lasers. Self-pumped phase conjugation is realized. The reflectivity takes values from 32% at 700 nm to 6% at 800 nm. These are the longest wavelengths at which the self-pumped phase conjugation has been observed in KNbO₃ at room-temperature operation.

© 1996 Optical Society of America

Infrared photorefractive effect in doped KNbO₃ crystals

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