Origin Of Thermal Fixing In Photorefractive Lithium Niobate Crystals

ternal reading field E,. Because this is a quadratic effect optimal reconstruction occurred at E, = 2 b. Results of EFM of three gratings are presented in Fig. 2. The three gratings were recorded under fields of 0.7, 1.7, and 2.7 kV/cm respectively. Finally, we multiplexed three images of a resolution target at three different angles under fields of 0.7, 1.7, and 2.7 kV/cm respectively. No cross talk was observed during reconstruction of the three images at the respective writing fields. These preliminary results clearly demonstrate that EFM is more effective when performed at the paraelectric phase when the electro-optic effect is quadratic.