Laser-pumped paraffin-coated cell rubidium frequency standard
Journal of Applied Physics, American Institute of Physics (AIP), 2012/111/12/124906-124913
We have realized and studied a rubidium atomic frequency standard based on a paraffin-coated cell, exhibiting a short-term frequency stability <3 × 10<sup>−12</sup> <i>τ</i><sup>−1/2</sup> between <i>τ</i> = 1 and 100 s. Characterization of the wall-coating is performed by measuring the <i>T</i><sub>1</sub>and <i>T</i><sub>2</sub> relaxation times. Perturbations of the medium- to long-term clock stability, due to variations in the laser-intensity, laser frequency, the microwave power shift, and the shifts due to temperature variations are measured and analyzed. A method for reducing the intensity light-shift by detuning the laser frequency and the resulting improvement in clock stability is demonstrated. This work is of relevance for further improvements on Rb cell standards using anti-relaxation wall-coating technology.
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