Analysis of novel cascaded /spl chi//sup (2)/ (SFG+DFG) wavelength conversions in quasi-phase-matched waveguides
Analysis of novel cascaded /spl chi//sup (2)/ (SFG+DFG) wavelength conversions in quasi-phase-matched waveguides
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DOI：
10.1109/jqe.2003.823023
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发表时间：
2004-03
影响因子：
2.5
通讯作者：
Bo Chen;Chang-Qing Xu
中科院分区：
文献类型：
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作者：
Bo Chen;Chang-Qing Xu
提出了一种新的级联二阶非线性相互作用（/spl chi//sup（2）/），它同时基于和频（SFG）和差频（DFG）过程，并在准相位匹配波长转换器中进行了分析。具有清晰的物理见解的解析表达式推导出的转换光。结果表明，与传统的基于二次谐波产生和差频产生（SHG+DFG）的级联波长转换技术相比，该方案采用两个输出功率较低的泵浦源（P/sub p1/，P/sub p2/），可以获得相同的转换效率。理论计算结果与实验结果一致。结果表明，在保持3 dB信号转换带宽的同时，泵浦波长差可以被75 nm的跨度分开。结果表明，新型的级联/spl chi//sup（2）/波长转换方案在实际应用中是非常有吸引力的。
A novel cascaded second-order nonlinear interaction (/spl chi//sup (2)/), which is simultaneously based on sum frequency generation (SFG) and difference frequency generation (DFG) processes, is proposed and analyzed in quasi-phase-matched wavelength converters. Analytical expressions with clear physical insights are derived for the converted light. It is shown that the same conversion efficiency can be achieved by employing two pump sources with lower output power (P/sub p1/,P/sub p2/) in this novel scheme as compared with the conventional cascaded wavelength conversion technique based on second-harmonic generation and difference frequency generation (SHG+DFG) with a single higher power pump beam (P/sub p/=P/sub p1/+P/sub p2/). The theoretical results are consistent with the experimental ones. It is found that the pump wavelength difference can be separated by a span as large as 75 nm, while large 3-dB signal conversion bandwidth is retained. The results show that the novel cascaded /spl chi//sup (2)/ wavelength conversion scheme is very attractive for practical applications.