14 - 15 $μ$ m区域的弯曲模式计量
Bending modes metrology in the 14-15 $μ$m region
摘要：
频率梳已经引发了从紫外到太赫兹频率的电磁波谱的不同区域的光学计量学的令人印象深刻的演变。然而，一个未探索的领域，仍然是在振动弯曲模式的区域，主要是由于缺乏单模激光器的中红外（MIR）光谱的长波长（LW）部分。我们填补了这一空白，通过一个纯粹的基于中反射镜的非线性激光源，可调谐性从12.1至14.8 $μ$ m，光功率高达110 $μ$ W，兆赫级的线宽和梳状校准。这使得在该区域的弯曲模式计量的第一个例子，与几个CO $_2$-基于频率基准的评估与不确定性低至30 kHz，和苯的$ν_{11}$带的准确研究，这是一个重要的测试台的光谱仪的分辨率。这些成就为LW-MIR计量学，旋转分辨研究和大分子（如芳烃）的天文观测铺平了道路。
英文摘要：
Frequency combs have triggered an impressive evolution of optical metrology across diverse regions of the electromagnetic spectrum, from the ultraviolet to the terahertz frequencies. An unexplored territory, however, remains in the region of vibrational bending modes, mostly due to the lack of single-mode lasers in the long-wavelength (LW) part of the mid-infrared (MIR) spectrum. We fill this gap through a purely MIR-based nonlinear laser source with tunability from 12.1 to 14.8 $μ$m, optical power up to 110 $μ$W, MHz-level linewidth and comb calibration. This enables the first example of bending modes metrology in this region, with the assessment of several CO$_2$-based frequency benchmarks with uncertainties down to 30 kHz, and the accurate study of the $ν_{11}$ band of benzene, which is a significant testbed for the resolution of the spectrometer. These achievements pave the way for LW-MIR metrology, rotationally-resolved studies and astronomic observations of large molecules, such as aromatic hydrocarbons.
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