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Timestamp: 2019-04-25 00:35:24+00:00

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Using the 2S1/2Fg=2→2P3/2Fe=3 transition in 87Rb vapor at room temperature, we study effect of the laser light polarization on the electromagnetically induced absorption (EIA). This work extends the recent study of the behavior of the EIA as a function of the laser ellipticity (Brazhnikov et. al., JETP Lett. 83, 64, 2006). We have shown that such behavior strongly depends on the laser power. For the low laser power EIA amplitude has maximum for linearly polarized light, while for high laser power elliptically polarized light of ellipticity 15–20° generates maximum of the EIA amplitude. EIA width varies slowly with the laser ellipticity at lower laser power, and much stronger at higher laser power. Through our theoretical model we attributed observed results to combined effect of the laser ellipticity and power on the population of ground state Zeeman sublevels.
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Fig. 1. Level diagram for the Fg =2→Fe =3 transition of 87Rb. Full lines stand for transitions induced by elliptically polarized laser light, while both full and dashed lines describe spontaneous emission.
Fig. 2. Experimental setup: ECDL - external cavity diode laser; OI - optical isolator; DDAVLL - Doppler-free dichroic atomic vapor laser lock; VNDF - variable neutral density filter; P - polarizer; D - detector.
Fig. 3. Theoretical (a) and experimental (b) Hanle EIA amplitudes as a function of the laser light ellipticity for the laser powers between 50 μW and 3 mW.
Fig. 4. Theoretical results for populations of ground states sublevels as a function of the external magnetic field, for three laser light ellipticities and for P=50μW (a) and P=1 mW (b); red and green lines are for populations of mg =±2 and mg =±1 sublevels, while blue lines are for mg =0 sublevel. Solid lines indicate populations of mg =+1,+2, while dashed-dotted lines are for mg =-1,-2 sublevels.
Fig. 5. Theoretical results for the sum of populations of ground state’s sublevels as a function of the external magnetic field, for three laser light ellipticities and for P=50μW (a) and P=1 mW (b); purple lines: sum of populations of even mg s; green lines: sum of populations of odd mg s.
Fig. 6. 3D vision for Hanle EIA widths as a function of the laser light ellipticity and power: experimental (a), and calculated (b).
Fig. 7. Comparison of Hanle EIA spectra for the transition Fg =2→Fe =3 between experimental (top row) and calculated (bottom row) for two laser powers, 50 μW (a) and 1 mW (b). Theoretical results show influence of the ground state decoherence rate γ for three different values: blue lines: γ = Γ 100 ; red lines: γ = Γ 529 ; green lines: γ = Γ 1000 . Theoretical curves for different γ were shifted along y-axis to have the same value for Bscan =0.
(2) E → ( t ) = e → x cos ( ω t ) E 0 x + e → y cos ( ω t + φ y x ) E 0 y .
(3) E g ( e ) = μ B g F g ( e ) m g ( e ) B scan .
(5) 풢 1 ~ 〈 n e L e ∥ r → ∥ n g L g 〉 .
(7) ( μ g i , e l , − 1 ( 풢 2 x + i e i φ y x 풢 2 y ) + μ g i , e l , 1 ( − 풢 2 x + i e i φ y x 풢 2 y ) ) ρ ~ e l g j ] − γ ( ρ g i g j − 1 5 δ ij ) .
(8) Π e = ∑ ρ e i e i .

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