论文标题
在定期降低硝酸锂波导中的低温第二次谐波产生
Cryogenic second harmonic generation in periodically-poled lithium niobate waveguides
论文作者
论文摘要
前瞻性综合量子光学技术将结合需要低温工作温度的非线性光学元件和组件。尽管利用$χ^{（2）} $的集成平台的流行率，例如用于量子光学的非线性，例如用于量子状态的生成和频率转换，但其低温下的材料属性在很大程度上却没有研究。在这里，我们在温度下降到4.4k的纤维偶联锂波导中证明了第一个第二次谐波生成。除了温度循环时，我们还观察到电信带内相匹配的泵波长的可重复变化。我们的结果确立了与低温量子技术兼容的多功能非线性光子积分平台。
Prospective integrated quantum optical technologies will combine nonlinear optics and components requiring cryogenic operating temperatures. Despite the prevalence of integrated platforms exploiting $χ^{(2)}$-nonlinearities for quantum optics, for example used for quantum state generation and frequency conversion, their material properties at low temperatures are largely unstudied. Here, we demonstrate the first second harmonic generation in a fiber-coupled lithium niobate waveguide at temperatures down to 4.4K. We observe a reproducible shift in the phase-matched pump wavelength within the telecom band, in addition to transient discontinuities while temperature cycling. Our results establish lithium niobate as a versatile nonlinear photonic integration platform compatible with cryogenic quantum technologies.
