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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Optical nutation under Raman excitation accompanied by considerable (up to inverted) population changes was observed, The Raman-active 6P(1/2)-6P(3/2) transition of thallium atoms was excited by picosecond pulses of a dye and an Nd:YAG laser. Transition polarization and upper level population were probed by delayed pulses at a fixed time by means of coherent Raman scattering and third harmonic generation schemes, respectively. Optical nutation manifested itself in corresponding changes of anti-Stokes and third harmonic signal energies as functions of the product of the pump pulses energies. As a result of the a.c. Stark shift, the nutation picture strongly depended on the sign of wavenumber detuning from the transition wavenumber.