Octave‐Spanning Second‐Harmonic Generation in Dispersion‐Engineered Lithium Niobate‐on‐Insulator Microwaveguide

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-07-10 DOI:10.1002/adpr.202400051
Yongzhi Tang, Tingting Ding, Yuting Zhang, Wenjun Ding, Yiwen Huang, Jiayu Wang, Hao Li, Shijie Liu, Yuanlin Zheng, Xianfeng Chen
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Abstract

Broadband lasers, e.g., ultrashort lasers, optical supercontinuum, and frequency combs, are revolutionary coherent light sources, which enable a plethora of state‐of‐the‐art applications ranging from precision spectroscopy to optical clocks. However, the spectral broadening of these coherent light sources mainly relies on the third‐order nonlinearity () and is difficult to extend to the visible or shorter wavelength regime. Second‐order nonlinearity (), which is orders of magnitude larger than , becomes a powerful tool for the frequency translation if its broadband operation is well addressed. Herein, an octave‐spanning second‐harmonic generation scheme is experimentally demonstrated beyond an extremely large frequency range of 135 THz and high conversion efficiency of 1% for sub‐100 pJ for the near‐infrared picosecond supercontinuum in a fiber–waveguide–fiber configuration. The process relies on ultrabroadband birefringence phase matching in the dispersion‐engineered lithium niobate‐on‐insulator ridge microwaveguide. The mode area of microwaveguide well matches with single‐mode lens fiber, reducing coupling loss and ensuring easy packaging. The method provides a new approach to span the wavelength range of coherent light with ‐based wavelength translation for supercontinuum or frequency combs into the visible regime. The result would find applications in spectroscopy, astrophysics, atomic optics, optical synthesis, etc.
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弥散工程铌酸锂绝缘体微波导管中的倍频程二次谐波生成
宽带激光器,如超短激光器、光学超连续激光器和频率梳,是革命性的相干光源,可实现从精密光谱学到光学时钟等大量最先进的应用。然而,这些相干光源的光谱增宽主要依赖于三阶非线性(),很难扩展到可见光或更短的波长范围。二阶非线性()比三阶非线性()大几个数量级,如果能很好地解决其宽带运行问题,二阶非线性()将成为频率转换的有力工具。在此,实验证明了一种倍频程跨二次谐波生成方案,其频率范围超过 135 太赫兹,在光纤波导-光纤配置中,近红外皮秒超连续的转换效率高达 1%,低于 100 pJ。该工艺依赖于色散工程铌酸锂-绝缘体脊微波导管中的超宽带双折射相位匹配。微波导管的模式区与单模透镜光纤匹配良好,从而降低了耦合损耗,并确保了封装的简易性。该方法为跨越相干光的波长范围提供了一种新方法。其结果将应用于光谱学、天体物理学、原子光学、光学合成等领域。
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