Fig. 1. Theory of EIT. (a) Level diagram of Rydberg atom; (b) saturated absorption spectroscopy of cesium atom; (c) phenomenon of EIT

Fig. 2. Schematic diagram of experimental setup

Fig. 3. Diagram of actual experimental device

Fig. 4. EIT spectrum in different coupling Rabi frequency Ω_c

Fig. 5. EIT linewidth W versus coupling Rabi frequency Ω_c in different probe Rabi frequency Ω_p

Fig. 6. Asymmetry indice γ of EIT spectrum versus coupling Rabi frequency Ω_c in different probe Rabi frequency Ω_p

Fig. 7. EIT linewidth W versus coupling Rabi frequency Ω_c after noise reduction

Fig. 8. Asymmetry indice γ of EIT spectrum versus coupling Rabi frequency Ω_c after noise reduction

Fig. 9. EIT linewidth W versus probe Rabi frequency Ω_p in different coupling Rabi frequency Ω_c

Fig. 10. Asymmetry indice γ of EIT versus probe Rabi frequency Ω_p in different coupling Rabi frequency Ω_c

Fig. 11. Relationship between fitting slope k and the coupling Rabi frequency Ω_c

Fig. 12. EIT linewidth W versus temperature of vapour cell T in different probe Rabi frequency Ω_p

Fig. 13. Asymmetry indice γ of EIT versus temperature of vapour cell T in different probe Rabi frequency Ω_p