Alexander M. Akulshin

STEEP ANOMALOUS DISPERSION IN COHERENTLY PREPARED RB VAPOR

Steep dispersion of opposite signs in driven degenerate two-level atomic transitions have been predicted and observed on the

One-dimensional lattice of permanent magnetic microtraps for ultracold atoms on an atom chip

{D}_{2}

Fast light in atomic media

line of

Directional infrared emission resulting from cascade population inversion and four-wave mixing in Rb vapor

{}^{87}\mathrm{Rb}

Doppler-Free Satellites of Resonances of Electromagnetically Induced Transparency and Absorption on the D 2 Lines of Alkali Metals

in an optically thin vapor cell. The intensity dependence of the anomalous dispersion has been studied. The maximum observed value of anomalous dispersion (

Power broadening of saturation absorption resonance on the D2 line of rubidium

\mathrm{dn}/d\ensuremath{\nu}\ensuremath{\simeq}\ensuremath{-}6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}{\mathrm{Hz}}^{\ensuremath{-}1}

Collimated blue light enhancement in velocity-selective pumped Rb vapour

) corresponds to a negative group velocity

Delay of squeezing and entanglement using electromagnetically induced transparency in a vapour cell

{V}_{g}\ensuremath{\simeq}\ensuremath{-}c/23000

Enhanced atomic Kerr nonlinearity in bright coherent states

.

Doppler-free two-photon resonances for atom detection and sum frequency stabilization

We report on the loading and trapping of ultracold atoms in a one-dimensional permanent magnetic lattice of period 10 µm produced on an atom chip. The grooved structure which generates the magnetic lattice potential is fabricated on a silicon substrate and coated with a perpendicularly magnetized multilayered TbGdFeCo/Cr film of effective thickness 960 nm. Ultracold atoms are evaporatively cooled in a Z-wire magnetic trap and then adiabatically transferred to the magnetic lattice potential by applying an appropriate bias field. Under our experimental conditions trap frequencies of up to 90 kHz in the magnetic lattice are measured and the atoms are trapped at a distance of less than 5 µm from the surface with a measured lifetime of about 450 ms. These results are important in the context of studies of quantum coherence of neutral atoms in periodic magnetic potentials on an atom chip.