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The nonlinear wavelength conversion can generate the laser wavelengths which are not directly available, thereby broadening the laser spectrum range. However, the existence of phase mismatch greatly limits the development and application of nonlinear optical technology. The wavelength conversion schemes in a manner analogous to population transfer in atomic rapid adiabatic passage, stimulated Raman adiabatic passage(STIRAP), and Stark chirped rapid adiabatic passage(SCRAP) provide feasible solutions for efficient and broadband wavelength conversion. SCRAP use the Stark shift caused by the Stark field to generate energy level crossings, thereby, the population in initial state can be efficiently converted to the target state. It does not require the two-photon resonance, can be applied to multi-photon transition. In this paper, by approximate analogy to the adiabatic population theory, a wavelength conversion model with the KTP crystals based on SCRAP is established, the influence of the coupling delay parameters, width parameters, pump intensity, temperature, and incident wavelength on the conversion process are systematically studied. The results show that signal laser energy can almost convert into output laser energy, while the intermediate laser energy is kept extremely low during the conversion process. The conversion process is sensitive to changes in coupling delay parameters, width parameters, and pump intensity. The farther away from the optimal coupling delay parameter, the lower the conversion efficiency. When the width parameter is fixed, as the width parameter increases, the conversion efficiency will first increase to the maximum, and then slowly decrease. At the same time, the greater the value of the width parameter , the greater the maximum conversion efficiency that can be achieved, and the greater the bandwidth that can achieve high-efficiency wavelength conversion. The conversion efficiency increases as the pump intensity increases. However, changes in temperature and incident wavelength have little effect on the conversion efficiency. The above research can provide a theoretical basis for the acquisition of ultraviolet to mid-infrared.

Wavelength conversion of KTP crystal based Stark-chirped rapid adiabatic passage