Abstract:We present the results of spectroscopic and polarization studies of dilute rubidium vapor exposed to a single-frequency linearly polarized diode laser radiation in a spectral range of atomic D 2 line. We report the origin of a circularly polarized radiation on V-type transitions of 87 Rb F = 2 −→ F = 3 and 85 Rb F = 3 −→ F = 4, and amplification of this radiation in backward direction caused by a partial population inversion among magnetic sublevels of the ground and excited levels. This is confirmed experimentally by high directivity of backward radiation, absence in its spectrum of 85 Rb F = 2 −→ F = 1 (Λ-type) radiation, as well as by different nature of intensity dependences of backward and fluorescence radiations.

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We have studied modification of the fluorescence spectra of a room-temperature atomic rubidium vapor in the region of 85 Rb and 87 Rb D2 line while changing the temporal rate of linear (triangular) scanning of laser radiation frequency. Increase of the ramping speed over certain value (≈ 10 6 MHz/s) results in essential modification of magnitudes of individual atomic transitions, different on rising and falling slopes, which characterize transition from a steady-state interaction regime to a transient one. Our experimental results are well consistent with the developed theoretical model. The obtained results can be used for determination of atomic system parameters such as ground-state relaxation rate. Possible follow-up actions on addressed control of atomic levels population is discussed.