Abstract
We simultaneously investigate the four-wave mixing and the fluorescence signals via two cascade electromagnetically induced transparency (EIT) systems in atomic rubidium vapor. By manipulating the deflection angle between the probe beam and certain coupling beams, the dark state can extraordinarily switch to bright state, induced by the angle-modulation on the dressing effect. Besides, in the fluorescence signal, the peak of two-photon fluorescence due to classical emission and the dip of single-photon fluorescence due to dressing effect are distinguished, both in separate spectral curves and in the global profile of spectrum. Meanwhile, we observe and analyze the similarities and discrepancies between the two ground-state hyperfine levels F = 2 and F = 3 of Rb 85 for the first time.
Highlights
The coherent superposition of atomic states forms the base for a great deal of interesting phenomena in nonlinear laser spectroscopy
When certain coupling beams are deflected with a small angle from their “normal” directions, the behaviors of the detected signals will change significantly: electromagnetically induced transparency (EIT) peak in the probe transmission spectrum would switch to EIA dip; the suppression of four-wave mixing (FWM) signal would alter to enhancement; and the pattern of fluorescence signals would change correspondingly
We separately show the results with the two ground-state hyperfine levels (GSHL) of 85 Rb : 5S1/2 F =3 in Fig. 2 and
Summary
The coherent superposition of atomic states forms the base for a great deal of interesting phenomena in nonlinear laser spectroscopy. By altering the frequency detunings of incident laser fields, the switch between dark state (EIT of probe transmission and suppression of FWM) and bright state (EIA of probe transmission and enhancement of FWM) is obtainable [2,13,15] It is reported recently by manipulating the phase difference between the two circularly polarized components of a single coherent field, the EIT-EIA switch could be realized [16]. By manipulation the deflection angle, the generated FWM and fluorescence processes can transform from suppression to enhencement along with the EIT-EIA switch in the probe transmission spectrum. Such angle-modulated switch could have potential applications in optical communication and quantum information processing. 5S1/2 F =3 of 85 Rb are compared for the first time
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