Hébert Nicolas Bourbeau, Boudreau Sylvain, Genest Jérôme, Deschênes Jean-Daniel
Opt Express. 2014 Nov 17;22(23):29152-60. doi: 10.1364/OE.22.029152.
We demonstrate a generalized method for dual-comb interferometry that involves the use of two frequency combs with quasi-integer-ratio repetition rates. We use a 16.67 MHz comb to probe an 80-cm-long ring cavity and a 100 MHz comb to asynchronously sample its impulse response. The resulting signal can be seen as six time-multiplexed independent interferograms. We perform a deconvolution of the photodetector's impulse response to prevent any crosstalk between these multiplexed data sets. The measurement is then demultiplexed and corrected with referencing signals. We obtain a measurement with a spectral point spacing of 16.67 MHz and a spectral SNR of 55 dB by averaging 15,000 interferograms, corresponding to a measurement time of 500 s. Compared to conventional dual-comb spectroscopy, this generalized technique allows to either reduce the spectral point spacing or the acquisition time by changing the repetition rate of only one of the combs.
我们展示了一种用于双梳干涉测量的通用方法，该方法涉及使用具有准整数比重复率的两个频率梳。我们使用一个16.67 MHz的频率梳探测一个80厘米长的环形腔，并使用一个100 MHz的频率梳异步采样其脉冲响应。所得信号可视为六个时分复用的独立干涉图。我们对光电探测器的脉冲响应进行去卷积，以防止这些复用数据集之间的任何串扰。然后对测量结果进行解复用并用参考信号进行校正。通过对15000个干涉图进行平均，我们获得了一个光谱点间距为16.67 MHz、光谱信噪比为55 dB的测量结果，对应测量时间为500秒。与传统双梳光谱相比，这种通用技术允许通过仅改变其中一个频率梳的重复率来减小光谱点间距或采集时间。
