Broadband second-harmonic generation in step-chirped periodically poled lithium niobate waveguides.
Broadband second-harmonic generation in step-chirped periodically poled lithium niobate waveguides.
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DOI：
10.1364/ol.450547
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发表时间：
2022-02
期刊：
影响因子：
3.6
通讯作者：
Xiao Wu;Li Zhang;Zhenzhong Hao;Ru Zhang;Rui Ma;Fang Bo;Guoquan Zhang;Jingjun Xu
中科院分区：
文献类型：
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作者：
Xiao Wu;Li Zhang;Zhenzhong Hao;Ru Zhang;Rui Ma;Fang Bo;Guoquan Zhang;Jingjun Xu
芯片上的周期性极化铌酸锂 (PPLN) 结构可实现高效的二阶非线性光学效应，这得益于严格的光限制和 d33 的利用。在这里，我们报告了绝缘体上 X 切割铌酸锂 (LNOI) 上的步进啁啾 PPLN 波导中宽带二次谐波 (SH) 的产生。使用压电响应力显微镜的非破坏性技术在 7 mm 的整个长度上证明了极化周期的高保真度。在从 1550 nm 到 1660 nm 扫描泵浦激光器的波长的同时，在步进啁啾 PPLN 波导中连续观察 SH 信号。在 1642 nm 处测得 SH 转换效率为 9.6 % W-1 cm-2。这项工作将有利于宽带光谱光源的波长转换。
Periodically poled lithium niobate (PPLN) structures on a chip enable efficient second-order nonlinear optical effects, benefiting from the tight light confinement and the utilization of d33. Here, we report a broadband second-harmonic (SH) generation in a step-chirped PPLN waveguide on X-cut lithium niobate on insulator (LNOI). The high fidelity of the poling period is demonstrated over the whole length of 7 mm using a non-destructive technique of piezoresponse force microscopy. The SH signal was continuously observed in the step-chirped PPLN waveguides while scanning the wavelength of the pump laser from 1550 nm to 1660 nm. The SH conversion efficiency was measured to be 9.6 % W-1 cm-2 at 1642 nm. This work will benefit wavelength conversions of light sources with wideband spectra.