Correcting photodetector nonlinearity in dual-comb interferometry

Photodetector nonlinearity, the main limiting factor in terms of optical power detection chain, is corrected to improve signal-to-noise ratio a short-time measurement dual-comb spectroscopy. An iterative correction algorithm minimizing out-of-band spectral artifacts based on nonlinearity methods used classical Fourier-transform spectrometers presented. The exactitude validated using low linear measurement. Spectroscopic lines H 12 CN are provided and increase absorption depth 24% caused by saturation detector yielding residuals limited noise.