Abstract
Amplitude and linewidts of the Hanle EIA, obtained from transmission of the laser locked to closed F(g) ? F(e) = F(g) +1 transitions in (85)Rb and(87)Rb, have maximum values at few mW/cm2. Amplitude of the EIA reaches steady value different from zero for higher laser intensities, even for laser intensities of 40 mW/cm(2). Theoretical model of EIA, for the same atomic system as in the experiment, show that the laser intensity, at which maximum of amplitudes and widths occur, depends on the laser detuning. For smaller laser detuning of a few tens of MHz, EIA has a maximum and then vanishes at higher laser intensities. For larger laser detuning of the order of hundreds MHz (but still in the range of Doppler broadening) amplitude of the EIA has very broad maximum and remains above zero for intensities above 40 mW/cm(2). Such theoretical results indicate that Hanle absorption peak remains in the experimental results, regardless of the laser intensities, due to Doppler effect.
Highlights
Induced absorption (EIA) is a phenomenon of increased absorption of radiation in atomic vapor resulting from the atomic coherence [1]
Experimental results for the Hanle Electromagnetically induced absorption (EIA) amplitude and width as a function of the laser intensity are given in Fig. 4 for the Fg = 2 −→ Fe = 3 transition in 87Rb, and in Fig. 5 for Fg = 3 −→ Fe = 4 transition in 85Rb
The errors for widths and amplitudes, given by error bars in Figs. 4 and 5 were estimated from experimental conditions and they are primarily due to presence of laboratory stray magnetic field, quality of polarizing optics, stability of laser intensity and frequency, and errors originating from fitting transmission curves
Summary
Induced absorption (EIA) is a phenomenon of increased absorption of radiation in atomic vapor resulting from the atomic coherence [1]. In very detailed study of open and closed Fg = 1 → Fe = 2 transition for the D1 line of 87Rb Goren at al., [20] have shown that for the same linear polarization of probe and pump lasers, probe EIA can switch to absorption dip only if Doppler broadening is not taken into account. Effect of small stray laboratory magnetic field of a few mG on the shape of Hanle absorption spectra and on EIA amplitudes and widths. Amplitudes and widths of EIT as a function of laser intensity was thoroughly studied in homogeneously and inhomogenously broadened medium [23] There are not such studies of EIA. To our knowledge this work is the first detailed study of behavior of Hanle EIA amplitude and linewidht at broad range of laser intensities
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