Experimental nonlinear interference comb spectroscopy


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Resumo

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.

Sobre autores

S. Pulkin

St. Petersburg State University

Autor responsável pela correspondência
Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

E. Borisov

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

M. Balabas

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

S. Savelyeva

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

S. Uvarova

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

V. Shevtsov

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

A. Kalinichev

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

V. Shoev

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

D. Venediktov

St. Petersburg State University

Email: s.pulkin@spbu.ru
Rússia, St. Petersburg, 199034

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