High resolution and fast detection of molecular vibrational absorption is important for organic synthesis, pharmaceutical processes, and environmental monitoring, and is enabled by mid-infrared (mid-IR) laser frequency combs via dual-comb spectroscopy. Here, we demonstrate a novel and highly simplified approach to broadband mid-IR dual-comb spectroscopy via supercontinuum generation, achieved using unprecedented nanophotonic dispersion engineering that allows for ultra-broadband and flat-envelope mid-IR frequency combs. Our mid-IR dual-comb spectrometer has an instantaneous bandwidth covering the functional group region from $2800$–$3600\;{{\rm cm}^{- {1}}}$, comprising more than 100,000 comb lines, enabling parallel gas-phase detection with a high sensitivity, sub-Doppler spectral resolution, and a high speed. In addition to the traditional functional groups, their isotopologues are also resolved in this supercontinuum-based dual-comb spectroscopy. Our approach combines well established fiber laser combs, digital coherent data averaging, and integrated nonlinear photonics, each in itself a state-of-the-art technology, signaling the emergence of mid-IR dual-comb spectroscopy for use outside of the protected laboratory environment.

中文翻译：

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基于纳米光子超连续谱的中红外双梳光谱

分子振动吸收的高分辨率和快速检测对于有机合成，制药过程和环境监测非常重要，并且通过双梳光谱法通过中红外（mid-IR）激光频率梳实现。在这里，我们演示了通过超连续谱产生的宽带中红外双梳状光谱的一种新颖且高度简化的方法，它是使用前所未有的纳米光子色散工程实现的，该工程可实现超宽带和平坦包络的中红外频率梳。我们的中红外双梳状光谱仪的瞬时带宽覆盖了功能组区域，从$ 2800 $ – $ 3600 \; {{\ rm cm} ^ {-{1}}} $包括超过100,000条梳状线，可实现具有高灵敏度，亚多普勒光谱分辨率和高速的并行气相检测。除了传统的官能团外，在基于超连续谱的双梳子光谱学中还可以解析它们的同位素。我们的方法结合了完善的光纤激光梳，数字相干数据平均和集成的非线性光子学，每种技术本身都是最先进的技术，这标志着中红外双梳光谱技术的出现，可在受保护的实验室之外使用环境。