Stable diode lasers for hydrogen precision spectroscopy J. Alnis, A. Matveev, N. Kolachevsky, T. Wilken, R. Holzwarth and T. W. Hänsch Eur. Phys. J. Special Topics, 163 (2008) 89-94 Published online: 25 October 2008 DOI: 10.1140/epjst/e2008-00811-y