Understanding photodetection nonlinearity in dual-comb interferometry
Philippe Guay, Alex Tourigny-Plante, Vincent Michaud-Belleau, Nicolas Bourbeau Hébert, Ariane Gouin, Jérôme Genest
Abstract
The impact of photodetector nonlinearity on dual-comb spectrometers is described and compared to that of Michelson-based Fourier transform spectrometers (FTS). The optical sampling occurring in the dual-comb approach, being the key difference with FTS, causes optical aliasing of the nonlinear spectral artifacts. Measured linear and nonlinear interferograms are presented to validate the model. Absorption lines of H 13 CN are provided to understand the impact of nonlinearity on spectroscopic measurements.
Topics & Concepts
PhotodetectionMichelson interferometerOpticsInterferometrySpectrometerNonlinear systemAliasingPhotodetectorFourier transformPhysicsFourier transform spectroscopySampling (signal processing)Materials scienceDetectorFourier transform infrared spectroscopyComputer scienceTelecommunicationsUndersamplingQuantum mechanicsAdvanced Fiber Laser TechnologiesPhotonic and Optical DevicesMechanical and Optical Resonators