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首页> 外文期刊>Selected Topics in Quantum Electronics, IEEE Journal of >Monolithic Photonics Using Second-Order Optical Nonlinearities in Multilayer-Core Bragg Reflection Waveguides
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Monolithic Photonics Using Second-Order Optical Nonlinearities in Multilayer-Core Bragg Reflection Waveguides

机译：在多层核心布拉格反射波导中使用二阶光学非线性的单片光子学

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摘要

Recent advancements in phase-matching second-order nonlinear processes by using matching-layer-enhanced Bragg reflection waveguides (ML-BRWs) in AlxGa1-xAs material system are discussed. The limitations on the choice of the AlxGa1-xAs layers for applications that require high pump power operation are highlighted. Multilayer-core ML-BRWs are proposed as a new waveguide design with relaxed constraints over the choice of the AlxGa1-xAs layers composition. The tradeoffs associated with material bandgap on the efficiency of second-order nonlinear processes are examined by using this novel structure. The interplay among the various factors, including the nonlinear overlap factor, the effective second-order nonlinearity, and the third-order nonlinear effects result in the presence of an optimum detuning of the core bandgap from the operating wavelength for maximum conversion efficiency. Two different wafer structures are examined by using second-harmonic generation to elucidate these tradeoffs. The conversion efficiency is examined by using 30-ps, 2-ps, and 250-fs pulses at various pump average power levels.
机译：Al x Ga 1-x 材料系统中使用匹配层增强的布拉格反射波导（ML-BRWs）在相位匹配二阶非线性过程中的最新进展讨论。突出了在需要高泵浦功率操作的应用中选择Al x Ga 1-x As层的局限性。提出了多层芯ML-BRW作为一种新的波导设计，其对Al x Ga 1-x As层组成的选择具有宽松的约束。通过使用这种新颖的结构，可以检查与材料带隙相关的权衡对二阶非线性过程效率的影响。包括非线性重叠因子，有效的二阶非线性和三阶非线性效应在内的各种因素之间的相互作用导致核心带隙与工作波长之间存在最佳失谐，从而获得最大转换效率。通过使用二次谐波产生来阐明这些折衷，研究了两种不同的晶圆结构。通过在各种泵平均功率电平下使用30 ps，2 ps和250 fs的脉冲来检查转换效率。

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