Investigation of PPLN Waveguide Uniformity via Second Harmonic Generation Spectra
Investigation of PPLN Waveguide Uniformity via Second Harmonic Generation Spectra
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DOI：
10.1109/lpt.2019.2957199
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发表时间：
2020-01
影响因子：
2.6
通讯作者：
A. Gray;S. Berry;L. Carpenter;J. Gates;Peter G. R. Smith;C. Gawith
中科院分区：
文献类型：
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作者：
A. Gray;S. Berry;L. Carpenter;J. Gates;Peter G. R. Smith;C. Gawith
提出了一种实验数据采集方法和相应的数值模型，以研究非线性光学中光波导的制作质量。该方法利用白光干涉测量和标准图像识别技术来计算波导传播常数函数。这使得能够将准相位匹配材料中的数值二次谐波频谱与波导的实验相位匹配频谱进行比较。用该方法得到的波导脊宽度的三次多项式与实验的相位匹配谱符合得很好。所提出的技术提供了一种非破坏性的方法来区分非线性波导设计中的制造步骤中的问题。
Experimental data collection methods and a corresponding numerical model are presented to investigate the quality of waveguide fabrication in nonlinear optics. The method utilises white light interferometry and standard image recognition techniques to calculate a waveguide propagation constant function. This enables comparison of a numerical second harmonic spectrum in quasi-phasematched materials, such as periodically poled lithium niobate, with the waveguide’s experimental phasematching spectrum. Using the presented method, a 3rd order polynomial fit to waveguide ridge width is demonstrated to be in good agreement with experimental phasematching spectra. The presented technique provides a nondestructive route to discriminate between issues in fabrication steps in nonlinear waveguide design.