Beam coupling in photorefractive liquid crystal light valves

摘要: Photorefractive liquid crystal light valves (LCLVs) are hybrid devices that combine a nematic layer with thin monocrystalline Bi12SiO20 (BSO) photorefractive in the form of cell wall. The device behaves as an optically addressed spatial modulator, where photoconductive is made BSO crystal. Differently from conventional types modulators, usually working retroreflective configuration, work transmission, thus allowing new applications related to coupling optical beams when they pass through layer. Here, we review some recent experiments beam LCLVs. After characterization terms its resolution, which features pattern formation feedback present two-beam and amplification single experiments. Then, develop theoretical model by taking into account Raman–Nath diffraction incoming over By using two or more cascade, show, both experimentally theoretically, two-wave mixing gain can be enhanced Talbot effect multi-passage successive layers Finally, show self-pumped phase conjugation realized placing valve tilted configuration. In this case, four-wave spontaneously created scattering signal onto induced grating.