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利用阶梯分段准相位匹配结构实现了基于级联倍频+差频效应的单通/双通宽带波长转换。对于固定的晶体长度,通过增加阶梯段数并合理设计准相位匹配结构参数,可以同时获得高转换效率、大转换带宽和高平坦性。当晶体长度为3cm时,在保证平坦度低于0.2dB的前提下,单通构型波长转换器的转换带宽和最大转换效率可分别达到177nm和-9.94dB,而双通构型的分别为170nm和-4.15dB。最后对基于阶梯分段准相位匹配结构的波长转换器与基于正弦啁啾光学超晶格和分段光栅结构的波长转换器的特性进行了对比分析,结果显示阶梯分段结构具有良好的综合特性。
The single-pass / double-pass broadband wavelength conversion based on the cascaded multiplier + difference frequency effect is realized by using the ladder-step quasi-phase matching structure. For a fixed crystal length, high conversion efficiency, large conversion bandwidth and high flatness can be obtained simultaneously by increasing the number of steps and designing the quasi-phase matching structure parameters rationally. When the crystal length is 3cm, the conversion bandwidth and the maximum conversion efficiency of the one-pass configuration wavelength converter can reach 177nm and -9.94dB respectively under the premise of ensuring the flatness lower than 0.2dB, while the two-pass configurations are 170 nm and -4.15 dB. Finally, the characteristics of the wavelength converter based on quasi-phase matching structure of stepped section and the wavelength converter based on sinusoidal chirped optical superlattice and segmented grating structure are compared and analyzed. The results show that the ladder section structure has good comprehensive characteristics .