High speed spatially multimode Λ-type atomic memory with arbitrary frequency detuning T. Golubeva, Y.M. Golubev, O. Mishina, A. Bramati, J. Laurat and E. Giacobino Eur. Phys. J. D, 66 10 (2012) 275 Published online: 30 October 2012 DOI: 10.1140/epjd/e2012-20723-3