THERMALLY INDUCED OPTICAL-PHASE CONJUGATION BY DEGENERATE 4-WAVE MIXING

Thermally induced optical phase conjugation by degenerate four-wave mixing (OPC-DFWM) offers considerable scope for high power adaptive optics applications. A detailed study of the optical phase conjugation in solutions of Rhodamine 6G and Rhodamine B in acetone, ethanol, methanol and water has been made with second harmonic 532 nm radiation of Nd: YAG under near zero time delay conditions. Reflectivity up to 50% has been obtained and as expected from theory, Rh6G and RhB both show a much larger reflectivity in acetone than in the other solvents due to the Q factor and higher thermalization yield in acetone. The dependence of reflectivity on the angle of interaction and the pump and probe beam intensities are also reported. The autotracing and healing property of OPC are demonstrated with photographs of the original, distorted and corrected beams. © (1988), (Indian Academy of Sciences). All Rights Reserved.