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首页> 外文期刊>IEEE Journal of Quantum Electronics >Wavelength conversions in quasi-phase matched LiNbO3 waveguide based on double-pass cascaded Χ(2) SFG+DFG interactions
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Wavelength conversions in quasi-phase matched LiNbO3 waveguide based on double-pass cascaded Χ(2) SFG+DFG interactions

机译：基于双通级联Χ（2）SFG + DFG相互作用的准相位匹配LiNbO3波导中的波长转换

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摘要

Based on the cascaded nonlinear interactions (Χ(2):Χ(2)) of sum- and difference-frequency generation (SFG+DFG), a novel all-optical wavelength conversion scheme is proposed for the first time in periodically poled LiNbO3 (PPLN) waveguide, in which a double-pass configuration is introduced. The performance of this scheme is thus different from the previous single-pass SFG+DFG scheme. The concept of the "balance condition" is presented to optimize the power and frequencies of the two pump sources. Under this condition, the energy is transferred irreversibly from the pump waves to the SF wave during the forward propagation. The equations describing the SFG can be solved analytically under this condition. Subsequently, the DFG equations are solved under the assumption that the SF wave would be constant during the backward propagation. Theoretical expressions are derived and are found to be consistent with numerical calculations. Compared with the conventional converter based on the cascaded Χ(2):Χ(2) interactions of second-harmonic generation and difference frequency generation SHG+DFG, the same conversion efficiency can be achieved in our scheme by employing two pump sources with lower power, or conversely higher conversion efficiency can be reached using two pump sources similar to that used in SFG+DFG scheme. The profile of the conversion efficiency can be further improved by adjusting the wavelengths of the two pump sources. In addition, compared with the single-pass SFG+DFG scheme, the main advantage of this new scheme rests on the fact that the conversion efficiency can be enhanced significantly. The advantages of the double-pass SHG+DFG scheme and the single-pass SFG+DFG scheme are combined in this new design to a great extent.
机译：基于和频和差频生成（SFG + DFG）的级联非线性相互作用（Χ（2）：Χ（2）），首次提出了一种新的全光波长转换方案，周期性极化LiNbO3（ PPLN）波导，其中引入了双通配置。因此，该方案的性能不同于先前的单通SFG + DFG方案。提出了“平衡条件”的概念，以优化两个泵源的功率和频率。在这种情况下，能量在正向传播期间从泵浦波不可逆地转移到SF波。在这种条件下，可以解析地描述描述SFG的方程。随后，在SF波在反向传播过程中保持恒定的假设下，求解DFG方程。理论表达式被推导并发现与数值计算一致。与基于二次谐波产生和差频产生SHG + DFG的级联Χ（2）：Χ（2）相互作用的常规转换器相比，在我们的方案中，通过使用两个功率较低的泵浦源可以实现相同的转换效率，或者使用类似于SFG + DFG方案中使用的两个泵浦源，可以达到更高的转换效率。通过调节两个泵浦光源的波长，可以进一步改善转换效率的特性。此外，与单通SFG + DFG方案相比，该新方案的主要优点在于可以大大提高转换效率。双通SHG + DFG方案和单通SFG + DFG方案的优点在此新设计中得到了很大程度的结合。

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