A rubidium-stabilized ring-cavity resonator for optical frequency metrology: precise measurement of the D1 line in 133Cs
Department of Physics, Indian Institute of Science, 560012 Bangalore, India
Corresponding author: a email@example.com
Revised: 30 December 2005
Published online: 28 March 2006
We have developed a ring-cavity resonator that can be used to measure the absolute frequencies of optical transitions with an uncertainty below 40 kHz. The length of the resonator is calibrated against a reference laser locked to the D2 line of 87Rb, the frequency of which is known with 6 kHz accuracy. We demonstrate the power of this technique by measuring the absolute frequencies of various hyperfine transitions in the D1 line of 133Cs. Our results agree with earlier measurements using the frequency-comb technique, and have similar accuracy. Measurement of the D1-line frequency could lead to a more precise determination of the fine-structure constant. We also report a precise value of A=291.918(8) MHz for the hyperfine constant in the 6P1/2 state.
PACS: 06.30.Ft – Time and frequency / 42.62.Eh – Metrological applications; optical frequency synthesizers for precision spectroscopy / 32.10.Fn – Fine and hyperfine structure
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006