Meek Samuel A, Hipke Arthur, Guelachvili Guy, Hänsch Theodor W, Picqué Nathalie
Opt Lett. 2018 Jan 1;43(1):162-165. doi: 10.1364/OL.43.000162.
Sub-Doppler broadband multi-heterodyne spectroscopy is proposed and experimentally demonstrated. Using two laser frequency combs of slightly different repetition frequencies, we have recorded Doppler-free two-photon dual-comb spectra of atomic rubidium resonances of a width of 6 MHz, while simultaneously interrogating a spectral span of 10 THz. The atomic transitions are uniquely identified via the intensity modulation of the observed fluorescence radiation. To the best of our knowledge, these results represent the first demonstration of Doppler-free Fourier transform spectroscopy and extend the range of applications of broadband spectroscopy towards precision nonlinear spectroscopy.
提出并通过实验证明了亚多普勒宽带多外差光谱技术。利用两个重复频率略有不同的激光频率梳，我们记录了宽度为6 MHz的铷原子共振的无多普勒双光子双梳光谱，同时探测了10 THz的光谱范围。通过观察到的荧光辐射的强度调制唯一地识别原子跃迁。据我们所知，这些结果代表了无多普勒傅里叶变换光谱的首次证明，并将宽带光谱的应用范围扩展到精密非线性光谱领域。
