Abstract
Applying external electric fields of as much as 65 kV/mm reveals significant enhancement of refractive-index changes and of photorefractive sensitivity S. Samples with different iron concentrations and oxidation–reduction states were investigated. Refractive-index changes of up to and sensitivities as high as were measured (ordinary light polarization; light wavelength, The refractive-index changes are space-charge limited, but the photorefractive sensitivity S exhibits for large externally applied electric fields a linear increase up to the highest field values used. No nonlinear enhancement of the charge transport was observed. However, the excellent high-field material performance and the record values for and S obtained improve the applicability of crystals.
© 2003 Optical Society of America
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