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Journal ArticleDOI

High Contrast Electromagnetically Induced Transparency in a Nitrogen Filled Rb Vapour Cell

17 Aug 2009-Laser Physics (SP MAIK Nauka/Interperiodica)-Vol. 19, Iss: 10, pp 2008-2013
TL;DR: In this paper, the authors observed the electromagnetically induced transparency (EIT) spectra inside a nitrogen filled Rb vapour cell (Rb-N2) in a five-level Λ-type system of D2 transition of Rb atom.
Abstract: We observe the electromagnetically induced transparency (EIT) spectra inside a nitrogen filled Rb vapour cell (Rb-N2) in a five-level Λ-type system of D2 transition of Rb atom. The high contrast EIT resonance in buffer gas filled Rb cell is obtained under our experimental conditions. The effect of velocity changing coherence preserving collisions to obtain the contrast resonance in buffer gas cell has been discussed. We measured the dependence of EIT width and height on pump intensity and find that the EIT width (FWHM) and peak height have a linear dependence on pump intensity. Our experimental results show that the presence of N2 buffer gas reduces the power broadening of the observed resonances.
Citations
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Journal ArticleDOI
TL;DR: Efficient all-optical modulation using Rb vapor confined to a hollow-core photonic bandgap fiber is demonstrated, corresponding to 23 photons per atomic cross section lambda(2)/(2pi).
Abstract: We demonstrate efficient all-optical modulation using Rb vapor confined to a hollow-core photonic bandgap fiber. The intensity of a signal field participating in the four-wave-mixing process is modulated using a weak switching field. We observe 3dB of attenuation in the signal field with only 3600 photons of switching energy, corresponding to 23 photons per atomic cross section λ2/(2π). Modulation bandwidths as high as 300MHz are observed.

24 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied electromagnetically induced transparency (EIT) in diatomic cesium molecules in a vapor cell by using tunable diode lasers.
Abstract: We have studied electromagnetically induced transparency (EIT) in diatomic cesium molecules in a vapor cell by using tunable diode lasers We have observed a sub-natural Λ-resonance in absorption molecular band B 1Π u − X 1Σ + at different cesium vapor pressures The width of the EIT resonance shows a linear dependence on a cesium vapor pressure

14 citations

Journal ArticleDOI
TL;DR: In this article, the experimental observations of double EIT and enhanced EIT signal in a combination of Λ- and V-type multi-level system of the D2 transition of 85Rb atoms interacting with three laser fields are reported.
Abstract: We report the experimental observations of double EIT and enhanced EIT signal in a combination of Λ- and V-type multi-level system of the D2 transition of 85Rb atoms interacting with three laser fields. The EIT formation under a Λ-type and V-type systems is also observed separately. It is found that the EIT width in a V-type system becomes narrower than the Λ-type system. Also the effect of frequency detuning of the control laser on the probe absorption profile is studied in presence of Λ- and V-type EIT systems.

11 citations

Journal ArticleDOI
TL;DR: In this article, a variety of coherent non-linear resonances were investigated experimentally in the presence of a standing wave pump field for the D2 transition of both Rb isotopes.

4 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the phenomenon of electromagnetically induced transparency (EIT) of 87Rb vapor with a buffer gas in a magnetic field at room temperature and found that the spectral lines caused by the velocity selective optical pump effects get much weaker and wider when the sample cell is mixed with a 5-Torr N2 gas while the EIT signal is kept almost unchanged.
Abstract: We have studied the phenomenon of electromagnetically induced transparency (EIT) of 87Rb vapor with a buffer gas in a magnetic field at room temperature. It is found that the spectral lines caused by the velocity selective optical pump effects get much weaker and wider when the sample cell is mixed with a 5-Torr N2 gas while the EIT signal is kept almost unchanged. A weighted least-square fit is also developed to remove the Doppler broadening completely. This spectral method provides a way to measure the Zeeman splitting with high resolution, for example, the Λ-type EIT resonance splits into four peaks on the D2 line of 87Rb in the thermal 2-cm vapor cell with a magnetic field along the electric field of the linearly polarized coupling laser. The high-resolution spectrum can be used to lock the laser to a given frequency by tuning the magnetic field.

3 citations