Gambetta Alessio, Vicentini Edoardo, Wang Yuchen, Coluccelli Nicola, Fasci Eugenio, Gianfrani Livio, Castrillo Antonio, Di Sarno Valentina, Santamaria Luigi, Maddaloni Pasquale, De Natale Paolo, Laporta Paolo, Galzerano Gianluca
Opt Lett. 2017 May 15;42(10):1911-1914. doi: 10.1364/OL.42.001911.
We report on absolute measurements of saturated-absorption line-center frequencies of room-temperature trifluoromethane using a quantum cascade laser at 8.6 μm and the frequency modulation spectroscopy method. Absolute calibration of the laser frequency is obtained by direct comparison with a mid-infrared optical frequency comb synthesizer referenced to a radio-frequency Rb standard. Several sub-Doppler transitions falling in the υ vibrational band are investigated at around 1158.9 cm with a fractional frequency precision of 8.6·10 at 1-s integration time, limited by the Rb-clock stability. The demonstrated frequency uncertainty of 6.6·10 is mainly limited by the reproducibility of the frequency measurements.
我们报告了使用波长为8.6μm的量子级联激光器和频率调制光谱法对室温下三氟甲烷饱和吸收线中心频率进行的绝对测量。通过与参考射频铷标准的中红外光学频率梳合成器直接比较，实现了激光频率的绝对校准。在υ振动带中，研究了几个位于1158.9 cm附近的亚多普勒跃迁，在1秒积分时间内，分数频率精度为8.6·10，受铷钟稳定性限制。所展示的6.6·10的频率不确定度主要受频率测量再现性的限制。
