Fig. 6From: Study of a periodic spectral fluctuation existing in a fibered optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS)a shows the transmitted light signal of the developed OF-CEAS system; b shows the absorption coefficient spectrum (black) and Voigt fitting of the absorptions of molecular H2O (red and green) based on HITRAN 2012 (P = 1.0 atm, T = 25 °C); the bottom shows the fit residualBack to article page