Transient phase detection with barium titanate novelty filters

Holographic enhancement in single crystal photorefractive fibers of Bi12Si020 (BSO) at 2i, = 514.5 nm and of Bii2Ti020 (BTO) at A, = 632.8 nm was measured as a function of spatial frequency and light polarization. Double phase conjugation of two mutually incoherent beams was observed in BTO-fiber under applied ac electric field.