C S Edwards et al 2005 Metrologia 42 464 doi:10.1088/0026-1394/42/5/018
C S Edwards1,2, G P Barwood1, H S Margolis1, P Gill1,2 and W R C Rowley1
Show affiliationsA pair of diode laser frequency standards stabilized to 778 nm two-photon rubidium transitions have been developed and characterized. Their sensitivity to vapour pressure, modulation depth and optical power have been investigated, along with their relative stability and day-to-day reproducibility. The Allan deviation of the standards locked to the 5 2S1/2(Fg = 3)–5 2D5/2(Fe = 5) transition of 85Rb is 9.3 × 10−13τ−1/2 for 1 s < τ < 100 s, reaching a floor of 1 × 10−13 at 100 s. The long-term repeatability of an individual system locked to this line is 1.2 kHz, corresponding to 3.1 parts in 1012. The system-to-system reproducibility is limited by cell impurities to 4.9 kHz and 4.5 kHz, respectively, for this line and the 5 2S1/2(Fg = 2)–5 2D5/2(Fe = 4) transition in 87Rb. The mean observed frequencies for these transitions, averaged for the two systems and corrected for light shift and second-order relativistic Doppler effect, are 385 285 142 375.1 (4.9) kHz and 385 284 566 374.2 (4.5) kHz, respectively.
42.60.Lh Efficiency, stability, gain, and other operational parameters
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
Issue 5 (October 2005)
Received 19 May 2005
Published 6 October 2005
C S Edwards et al 2005 Metrologia 42 464
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