We report simultaneous observation of the N- and EIT- resonances formation using multi-region (MR) cell, which contains micrometric –thin region with the thickness L varying in the range of 1μm - 90μm. MR cell is filled with natural Rb and 150 Torr neon gas. To form N- and EIT- resonances in Λ-system, two lasers are used: the probe (with tunable frequency), and the coupling (with the fixed frequency) with λ ≈ 795 nm wavelength and 1MHz- line-width. Although, the best parameters of N-resonance could be obtained for a cell thickness about 1cm, the use of MR cell with the thickness 30-40 μm still allows to obtain a good contrast and a narrow line-width. The N-resonance demonstrates subnatural increase of the probe absorption and is formed when probe frequency ν_P1 is in resonance with the ⁸⁵Rb transition F_g=2 →5P_1/2, while for the coupling frequency the condition υ_C = υ_P1 + Δ₁ (Δ₁=3036 MHz) is fulfilled. The EITresonance is formed when ν_P2 scans the transition ⁸⁷Rb, F_g=2 →5P_1/2 and for the same coupling frequency the condition υC = υ_P2 +Δ₂ (Δ₂=6835 MHz) should fulfill. The frequency separation between N- and EIT-resonances is equal to Δ₂-Δ₁≈ 3.8 GHz. We also detected the low-frequency beating signal when the condition υ_C ≈ ν_P' is fulfilled, which allows a directly determine the coupling frequency υ_C. Splitting of N-resonance in the external longitudinal magnetic field into five components is detected. Possible applications are addressed.

Date Published: 15 March 2013
PDF: 6 pages
Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87700K (15 March 2013); doi: 10.1117/12.2010673

Published in SPIE Proceedings Vol. 8770:
17th International School on Quantum Electronics: Laser Physics and Applications
Tanja N. Dreischuh; Albena T. Daskalova, Editor(s)