Extended Data Fig. 4: Interferogram data.
From: Modulated ringdown comb interferometry for sensing of highly complex gases
a, Experimental interferogram raw data collected as a function of time from the two photodetectors measuring the cavity transmitted comb light (red and blue). The black trace is the balanced output obtained from data post-processing. b, Zoom-in of a into ±2 ms. c, Fourier-transformed spectra for data in a over the time span of 20 ms. Signal carriers at nωm ± ωi and non-cosine modulated terms at nωm are labelled. For these data, ωm = 13 kHz and ωi ≈ 34 kHz. All traces in a–c are vertically offset for clarity.
