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Ruthenium can easily be incorporated into Bi 12 SiO 20 (BSO) and an unusually high (1.3cm −1 ) photorefractive gain was measured in the diffusion regime with a krypton laser at 647nm. One particular experiment demonstrated that electron and hole gratings could eventually be formed with different time constants, thus leading to a reduction of the gain. Several complementary...
In contra-directional two-beam coupling using photorefractive reflection gratings in LiNbO 3 :Fe, noise is observed in the form of quasi-periodic temporal instabilities. These instabilities result from different mechanisms that affect the magnitude of the space-charge field, and are attributed to the strong photovoltaic field generated in LiNbO 3 :Fe. A method of coating the z-surfaces...
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