论文标题
刺激的拉曼碎片计量学
Stimulated-Raman-Scattering Metrology
论文作者
论文摘要
频率梳子已经彻底改变了光学频率计量学，从而确定了大量分子物种的高度精确过渡频率。尽管有公认的科学兴趣，但这些进步仅由于其固有的横截面而略微受益于红外活动过渡。在这里，我们通过引入刺激的拉曼散射计量来克服这一局限性，其中利用频率梳子来校准泵和stokes激发激光器之间的频率。我们将这种方法应用于分子氢来测试量子电动力学。我们测量h $ _2 $的Q（1）基本线的过渡频率约4155 cm $^{ - 1} $，几乎没有零件的不确定性，这与从头开始计算的理论基准相媲美，并且比艺术实验状态更好十年以上。我们经过梳理的刺激的拉曼散射光谱仪可以在50-5000 cm $^{ - 1} $范围内应用于许多其他红外活性过渡，从而扩展了光频率计量学的工具包，并将其简单地进行。
Frequency combs have revolutionized optical frequency metrology, allowing one to determine highly accurate transition frequencies of a wealth of molecular species. Despite a recognized scientific interest, these progresses have only marginally benefited infrared-inactive transitions, due to their inherently weak cross-sections. Here we overcome this limitation by introducing stimulated-Raman-scattering metrology, where a frequency comb is exploited to calibrate the frequency detuning between the pump and Stokes excitation lasers. We apply this approach to molecular hydrogen to test quantum electrodynamics. We measure the transition frequency of the Q(1) fundamental line of H$_2$ around 4155 cm$^{-1}$ with few parts-per-billion uncertainty, which is comparable to the theoretical benchmark of ab initio calculations and more than a decade better than the experimental state of the art. Our comb-calibrated stimulated Raman scattering spectrometer extends the toolkit of optical frequency metrology as it can be applied, with simple technical changes, to many other infrared-inactive transitions, over a 50-5000 cm$^{-1}$ range that covers also purely rotational bands.
