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In this paper, we demonstrate a domain inversion crystal structure to studythe cascaded three-wave mixing process in a two peak Stark-chirped rapidadiabatic passage. We have achieved efficient wavelength conversion, which canbe performed in intuitive order and counterintuitive order. The requirement ofcrystal is reduced and the flexibility of structure design is improved. Whenthe conversion wavelength is fixed, increasing the coupling coefficient betweenthe two peaks can reduce the intensity of the intermediate wavelength whilemaintaining high conversion efficiency. Compared with the cascaded wavelengthconversion process based on stimulated Raman rapid adiabatic passage, thetwo-peak Stark-chirped rapid adiabatic passage has a larger convertiblewavelength bandwidth. This scheme provides a theoretical basis for obtainingmid-infrared laser source via flexible crystal structure.

Efficient cascaded wavelength conversion under two-peak Stark-chirped rapid adiabatic passage via grating structures