S. Haslinger, R. Amusuess, Ch. Koller, C. Hufnagel, N. Lippok, J. Majer, J. Verdu, S. Schneider, and J. Schmiedmayer
submitted http://arxiv4.library.cornell.edu/PS_cache/arxiv/pdf/1003/1003.5144v2.pdf, accepted in Applied Phys. B
Applied physics B - Lasers and Optics, 102 (2011), pp. 819 - 823
doi 10.1007/s00340-011-4447-x