Interaction of Phase-Modulated Femtosecond Pulses with an Optically Dense Quasi-Resonant Medium of Rubidium Vapors
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For the first time, it is demonstrated that the magnitude and sign of the effect of “spectral condensation” of a laser pulse at the resonant-transition frequency of a dense medium can be controlled by changing the driving-pulse parameters (chirp, pulse width, and pulse amplitude). In the process of this, importantly, the driving-pulse energy and spectrum remain unchanged. Direct time-resolved measurements revealed an oscillatory character of the induced superradiance of rubidium vapors representing a long train of decaying short pulses. The width and repetition rate of the pulses in the train are determined by atomic density N0 of the medium, while the width of an entire superradiance pulse (10 ps) is considerably larger than that of the driving laser pulse (50 fs).
This work was supported by the Russian Science Foundation (project no. 17-19-01097) and a grant from St. Petersburg State University (no. 11.40.533.2017). Part of the experiments was carried out at the St. Petersburg State University Research Resource Center Physical Methods of Surface Investigation. I.B.M. is grateful to the Russian Foundation for Basic Research (grant no. 18-02-01095) for additional su-pport.
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