High speed spatially multimode Λ-type atomic memory with arbitrary frequency detuningT. Golubeva, Y.M. Golubev, O. Mishina, A. Bramati, J. Laurat and E. GiacobinoEur. Phys. J. D, 66 10 (2012) 275DOI: https://doi.org/10.1140/epjd/e2012-20723-3