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Observation of narrow resonances inside homogeneously self-broadened lines in pump-probe reflection experiments

1997    Sautenkov, VA; Gamidov, RG; Weis, A

We report the experimental investigation of spectral hole burning and four-wave mixing at the interface of glass and a dense cesium vapor using two tunable diode lasers in a pump-probe experiment. Narrow spectral features were observed in the center of the strongly self-broadened D-2 line at Cs number density from 9x10(15) to 2.8x10(16) cm(-3). The origin of the resonances is associated with the coherent scattering of laser beams at a self-induced population grating, and their spectral widths reflect the relaxation rate of the population difference. A simple asymptotic expression is used to fit the spectral Line shapes and to infer a population relaxation time of 3.7(2) ns, which is almost an order of magnitude shorter than natural lifetime of the excited state.