Electromagnetically induced transparency: The thickness of the vapor column is of the order of a light wavelength

University of Burgundy, Dijon, Bourgogne, France
Journal of the Optical Society of America B (Impact Factor: 1.97). 08/2007; 24(8):1829-1838. DOI: 10.1364/JOSAB.24.001829


Electromagnetically induced transparency (EIT) effect has been studied using an extremely thin cell (ETC) with the thickness of an Rb vapor column of the order of light wavelength λ(780nm) and varying in the range of 0.5λ–2.5λ . Λ-systems on the D2 line of Rb85 and Rb87 have been studied experimentally. Along with EIT resonance, we study the peculiarities of velocity-selective optical pumping/saturation (VSOP) resonances, which accompany the EIT resonance and, as a rule, are spectrally broader. It is demonstrated that size-conditioned strongly anisotropic contribution of atoms with different velocities in an ETC causes several dramatic differences of the EIT and VSOP resonances formation in the ETC as compared with an ordinary 1–10cm long cell. Particularly, in the case of the ETC, the EIT linewidth and contrast dramatically depend on the coupling laser detuning from the exact atomic transition. A theoretical model taking into account the peculiarities of transmission spectra when L=nλ and L=(2n+1)λ/2 (n is an integer) has been developed. The experimental transmission spectra are well described by the theoretical model developed. The possibility of EIT resonance formation when atomic column thickness is of the order of L=0.5λ and less is theoretically predicted

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Available from: D. Sarkisyan, Dec 16, 2013
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    • "EIT resonance can occurs in -system with a two long-lived states and one excited state coupled by two laser fields (so called coupling and probe lasers). From the application point of view it is important to reduce dimensions of the cell which are containing atomic vapor of metal where an EIT resonance is formed, while keeping resonance parameters good (such as narrow line-width and contrast)[20] [21] [22] [23] [24]. "
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    ABSTRACT: The electromagnetically induced transparency (EIT) on the atomic D 1 line of rubidium is studied using a nanometric-thin cell with atomic vapor column length in the range of L=400–800nm. It is shown that the reduction of the cell thickness by four orders as compared with an ordinary cm-size cell still allows to form an EIT resonance for L=λ=794nm with the contrast of up to 40%. Further reduction of thickness to L=λ/2 leads to significant reduction of EIT contrast, verifying that the key parameter for EIT in wavelength-scale-thickness cells is not the value of L itself but L/λ ratio. Remarkable distinctions of EIT formation in nanometric-thin and ordinary cells are demonstrated. Well-resolved splitting of the EIT resonance in a magnetic field for L=λ can be used for magnetometry with nanometric spatial resolution. The presented theoretical model well describes the observed results.
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    ABSTRACT: We report observation of a narrow (sub-natural) and high-contrast resonance of increased absorption ("bright" resonance) in Rb cell with Ne buffer gas under previously unexplored experimental conditions for coupling and probe radiation configuration. The coupling laser stabilized frequency is detuned by ~ 3 GHz from 5S1/2, Fg=3 --> 5P3/2, Fe=2,3,4 transitions, while the probe laser frequency is scanned across these transitions. We believe the bright resonance formation, occurring when the probe laser frequency is blue-shifted from the coupling frequency by a value of the ground state hyperfine splitting, is caused predominantly by a 2-photon absorption of the probe radiation 5S1/2, Fg=2 --> 5S1/2, Fg=3 with 5P3/2 as an intermediate state. We also report and interpret splitting of the bright resonance into 6 well resolved and contrast components in moderate magnetic fields (B ~ 10 - 250 G).
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