Ren Xinyi, Dai Hu, Li Detian, Huang Kun, Hu Mengyun, Lv Tianjian, Yan Ming, Zeng Heping
Opt Lett. 2020 Feb 1;45(3):776-779. doi: 10.1364/OL.385464.
In this Letter, we utilize an acoustic-optic frequency shifter in a feedforward manner for automatic interpolation of dual-comb spectroscopy, where frequency tuning can be achieved at 5.45 THz/s with the step size precisely locked to the line spacing (54.5 MHz) of a referenced optical comb without complicated electronics or control programs. Our dual-comb spectrometer involves two near-infrared electro-optic combs at 25 GHz line spacings, nonlinearly converted into the mid-infrared region, revealing fundamental absorption lines of methane gas at 54.5 MHz resolution within a spectral range from 88.04 to 89.04 THz. The method and the system may be useful in many applications, including gas sensing.
在本信函中，我们以前馈方式利用声光频率移位器实现双梳光谱的自动插值，其中频率调谐可在5.45太赫兹/秒的速度下实现，步长精确锁定到参考光学频率梳的线间距（54.5兆赫兹），无需复杂的电子设备或控制程序。我们的双梳光谱仪涉及两个线间距为25吉赫兹的近红外电光频率梳，它们非线性转换到中红外区域，在88.04至89.04太赫兹的光谱范围内以54.5兆赫兹的分辨率揭示了甲烷气体的基本吸收线。该方法和系统可能在包括气体传感在内的许多应用中有用。
