Interference Femtosecond Linear and Nonlinear Comb-Spectroscopy in Octave Expanded Range
We proposed linear and nonlinear interference comb-spectroscopy in order to study the interaction of a train of femtosecond pulses with an atomic medium experimentally and theoretically. Numerical calculations of the interaction of a train of short femtosecond pulses with atomic vapor has been made for comparison with experimental results. It is shown that interference of atomic states produces unidirectional coherent radiation on an adjacent transition (blue radiation at 420 nm) when input near IR radiation (780 nm) is focused into the cell filled with Rb atoms.
The experiments results were performed in the Research Center for “Optical and laser methods of substance research” at the St. Petersburg State University. The financial support provided by RFBR grant N 18-02-01095 is gratefully acknowledged. V. Yu. Venediktov fulfills the State Contract of the Russian Federal Ministry of Education and Science, “Organization of Scientific Researches.” The authors thank Prof. Kaoru Yamanouchi (The University of Tokyo) for his careful reading of the manuscript and for his valuable comments.
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