1Lab. de Physique des Lasers, Atomes et Molécules, CNRS (France) 2ONERA (France) 3Institut Fresnel (France) 4Turing Ctr. for Living Systems (France) 5Aix Marseille Univ., CNRS (France) 6Univ. of Michigan (United States) 7Univ. de Lille (France)
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We demonstrated a novel technique to improve the signal to noise ratio (SNR) of the frequency domain interferogram of a dual comb spectroscopy (DCS) setup, by about 5 dB, based on temporal shifting of the interfering pulse trains in the two channels. The experimental setup utilized a fiber based DCS architecture where electro-optic modulators (EOM) were used to generate two optical combs (or pulse trains). Due to this carefully adjusted periodic phase shifts, the interferogram now was time-multiplexed, or in other words included a larger number of peaks within a given time frame compared to when an unshifted case. There is nevertheless a tradeoff between the peak power and the bandwidth of the interferogram comb envelope in the spectral domain. The experimental results were also confirmed numerically and a relationship between the SNR improvement and the rate of phase shifting was established. These results open new possibilities in SNR improvement of EOM based multidimensional spectroscopic techniques and provide a powerful resource to execute sparse sampling and other complex techniques to maximize the amount of useful information in the interferogram data of a DCS setup.
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Debanuj Chatterjee, Eve-Line Bancel, Siddharth Sivankutty, Herve Rigneault, Steven Cundiff, Arnaud Mussot, "Improvement of the signal-to-noise ratio in dual comb spectrometry through time multiplexing," Proc. SPIE 12999, Optical Sensing and Detection VIII, 129991H (20 June 2024); https://doi.org/10.1117/12.3016986