Abstract
We show that high-temperature reduction in a CO–CO2 atmosphere increases the photorefractive sensitivity of KNbO3:Rh at 860 nm by 4 orders of magnitude compared with that of the as-grown crystal. The effective trap density is increased by a factor of 3, and the photoconductivity by a factor of 30, and the photorefractive response at a grating spacing of 0.15 is accelerated by a factor of 400. The grating buildup time at a grating spacing of 0.7 and an intensity of is 0.5 s, a value comparable with that of as-grown KNbO3:Fe at visible wavelengths. The optical and photorefractive parameters of Rh-doped KNbO3 subjected to reduction treatment are characterized for wavelengths of 0.48–1.064 .
© 1997 Optical Society of America
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