Photorefractive amplifier-converter and coherent oscillator with nonexponential gain

P Jullien, P Lompré, P Mathey, S Odoulov, E Krätzig
2001 Journal of Optics. A, Pure and applied optics  
For some parametric interactions with identically zero exponential gain for the signal wave the intensity of the idler wave can grow as a second power of the propagation coordinate. Such an amplification is revealed for the parametric mixing of four copropagating waves in BaTiO 3 ; two of them are ordinarily polarized and the two others are extraordinarily polarized. This mixing is used to build up a coherent oscillator. A reasonable qualitative agreement of the experimental results with the calculated data is demonstrated.
doi:10.1088/1464-4258/3/2/303 fatcat:4oeleyr2svd33hmmnvqte46p6i