论文标题
向上转换中红外双弯曲光谱
Upconversion mid-infrared dual-comb spectroscopy
论文作者
论文摘要
我们设计了一种新的检测技术，用于中红外多螺旋光谱。作为实验实现，中红外光在基本CH，OH，NH分子中的3- $ $ M区域中询问了气体样品，并在近红外的电信区域进行了检测。谱图显示了18000个分辨的100 MHz间距的梳子线，以接近射击限制的灵敏度记录。该演示增加了双弯曲光谱的独特优势，例如潜在的非常高的分辨率，可忽略不计的仪器线宽度以及使用原子时钟对频率尺度进行直接校准。我们还表明，具有差分光探测器模块的直接中国检测在低中部平均功率的极限上是有益的。
We devise a new detection technique for mid-infrared multi-heterodyne spectroscopy. As an experimental implementation, mid-infrared light interrogates a gas sample in the 3-$μ$m region of the fundamental CH, OH, NH stretch in molecules and detection is performed in the near-infrared telecommunication region. Spectra showing 18000 resolved comb lines of 100-MHz spacing are recorded at a sensitivity close to the shot-noise limit. The demonstration adds to the unique advantages of dual-comb spectroscopy, such as potential very high resolution, negligible instrumental line width, and direct calibration of the frequency scale with an atomic clock. We also show that direct mid-infrared detection with a differential photo-detector module is beneficial in the limit of low mid-infrared average power.
