Abstract
Two systems are built in which a commercially available GaAlAs laser diode is stabilized on a hyperfine component of the 5S 1 2 −5D ( 3 2 , 5 2 ) two-photon transitions in rubidium at λ=778 nm ( v=385 THz). Some preliminary metrological results are presented. The frequency repeatability has been found to be of 200 Hz (5.2 parts in 10 13) and a short-term frequency stability of 3×10 -13/ τ /gt up to 2000 s is currently obtained.
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