Abstract

We determine several photorefractive properties of undoped, Cr-doped, and Cu-doped (K_yNa_1–y)_2z, (Sr_xBa_1–x)_1–z Nb₂O₆ (KNSBN) crystals by means of two-beam coupling measurements. An elemental analysis of the crystals to determine their compositions and impurities is also performed. It is found that two-beam coupling gain of the Cr-doped KNSBN at 514.5 nm is enhanced by ~10 times that of the undoped KNSBN, while its response speed remains substantially unchanged. Longer-wavelength photorefractivity is also observed in the Cr-doped KNSBN. Quasi-periodic oscillations of the probe-beam intensity in the two-beam coupling experiment are observed in the Cu-doped KNSBN.

© 1993 Optical Society of America

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