Abstract
A means of nonlinear interferential comb spectroscopy with increased sensitivity is propsed. Radiation from the comb-generator of a femtosecond laser is focused at the center of a cell with vapors of rubidium atoms, mounted in an arm of a Michelson interferometer. This technique is an improvement of Rozhdestvenski hooks method, with digital registration by the detectors on a CCD array being substituted for the photographic registration of interferograms, resulting in increased interferometric sensitivity (holographic interferometry). A primary spectrogram is processed in digital form on a dual-beam interferometer equipped with a phase modulator to improve sensitivity with the possibility of an a posteriori increase in interferometric sensitivity. Dispersive signals appear in the interferogram spectrogram on two-photon absorption lines when the pumping radiation is focused at the center of a cell with Rb vapors. Nonlinear processes of coherent radiation due to nonlinear interference effects are studied. Numerical simulations are performed that confirm the proposed theoretical model.
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Original Russian Text © S.A. Pulkin, E.N. Borisov, M.V. Balabas, S.V. Savelyeva, S.V. Uvarova, V.S. Shevtsov, A.A. Kalinichev, V.I. Shoev, D.V. Venediktov, 2017, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2017, Vol. 81, No. 12, pp. 1661–1663.
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Pulkin, S.A., Borisov, E.N., Balabas, M.V. et al. Experimental nonlinear interference comb spectroscopy. Bull. Russ. Acad. Sci. Phys. 81, 1466–1467 (2017). https://doi.org/10.3103/S1062873817120255
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DOI: https://doi.org/10.3103/S1062873817120255