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Eur. Phys. J. Special Topics 163, 89-94 (2008)
DOI: 10.1140/epjst/e2008-00811-y
Stable diode lasers for hydrogen precision spectroscopy
J. Alnis1, A. Matveev1, 2, N. Kolachevsky1, 2, T. Wilken1, R. Holzwarth1 and T.W. Hänsch11 MPI für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany
2 P.N. Lebedev Physics Institute, Leninsky Prosp. 53, 119991 Moscow, Russia
Janis.Alnis@mpq.mpg.de
Abstract
We report on an external cavity diode laser at 972 nm
stabilized to a mid-plane mounted Fabry-Perot (FP) resonator with a
finesse of 400000. The 0.5 Hz optical beat note line width between
two similar lasers (Allan deviation 2 
10-15) is limited
by thermal noise properties of two independent FP resonators. The
long term drift of the FP resonator and mirror substrates made from
Ultra-Low-Expansion glass (ULE) is small and can be well predicted
on time intervals up to many hours if the resonator is stabilized at
the zero thermal expansion temperature Tc. Using a Peltier
element in a vacuum chamber for temperature stabilization allows
stabilization of the FP cavity to Tc which is usually below the
room temperature. Beat note measurements with a femtosecond optical
frequency comb referenced to a H-maser during 15 hours have shown a
well defined linear drift of the FP resonance frequency of about 60 mHz/s with residual frequency excursions of less than 
Hz.
© EDP Sciences, Springer-Verlag 2008
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