David V Sheludko et al 2007 J. Phys.: Conf. Ser. 80 012040 doi:10.1088/1742-6596/80/1/012040
David V Sheludko1, Simon C Bell1, Edgar J D Vredenbregt2 and Robert E Scholten1
Show affiliationsWe have investigated state-selective diffraction contrast imaging (DCI) of cold 85Rb atoms in the first excited (52P3/2) state. Excited-state DCI requires knowledge of the complex refractive index of the atom cloud, which was calculated numerically using a semi-classical model. The Autler-Townes splitting predicted by the model was verified experimentally, showing excellent agreement.
780 nm lasers were used to cool and excite atoms within a magneto-optical trap, and the atoms were then illuminated by a 776 nm imaging laser. Several excited-state imaging techniques, including blue cascade fluorescence, on-resonance absorption, and DCI have been demonstrated. Initial results show that improved signal-to-noise ratio (SNR) will be required to accurately determine the excited state fraction. We have demonstrated magnetic field gradient compression of the cold atom cloud, and expect that further progress on compression and additional cooling will achieve sufficient diffraction contrast for quantitative state-selective imaging.
32.60.+i Zeeman and Stark effects
31.15.xg Semiclassical methods
32.50.+d Fluorescence, phosphorescence (including quenching)
Issue 1 (2007)
David V Sheludko et al 2007 J. Phys.: Conf. Ser. 80 012040