Theoretical and experimental study on commensurable dual-periodic optical superlattice for multiple frequency conversions

We present a commensurable dual-periodic optical superlattice (CDPSL) to produce a device with multiple phase-matching wavelengths. Characters of the CDPSL are studied theoretically. It is not sensitive to fabrication errors and can provide a high-quality structure. Experimentally highly efficient multiple parametric lights are obtained. The efficiency of total parametric output power over pump power is 28.1%. The scheme is an attractive way to construct multi-wavelength laser source.