Abstract
We determine several photorefractive properties of undoped, Cr-doped, and Cu-doped (KyNa1–y)2z, (SrxBa1–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.
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