Mutually Pumped Phase-Conjugate Mirror: Sickle Configuration

A mutually pumped phase conjugator is demonstrated with a novel photorefractive crystal of copper-doped potassium sodium strontium barium niobate, in which the beams travel in a geometric path similar to the outline of a sickle. The maximum reflectivity is up to 168%. Faster response times are measured and are also simulated as a function of incident beam power ratio. Four available input geometries are found. The phase conjugation signals exist wide range of angular and positional alignment. No apparent cross talk is observed. The faster build-up process of phase conjugation beams is tentatively explained.