Abstract
One of the most important problems in achieving daily frequency instability \(\sigma _{y} < 5 \cdot 10^{{ - 14}}\) of on-board rubidium atomic clocks on absorption cell with working 87Rb atoms and mixture of buffer gases is realization of the TFS parameter — of temperature frequency shift \(\delta \nu \left( T \right)\) at the level of \(\ \le 3 \cdot 10^{{ - 12}} /\, {^\circ } {\text{C}}.\) The temperature dependence of the microwave “0–0” transition frequency \(\nu \left( T \right)\) has an extremum with a small flat top ∆T ~ 0.5 °C to which the 87Rb-cell operating temperature is tuned. Significant difficulties arise in maintaining the high stability of this small ∆T zone under conditions of increased 87Rb cell operating temperature, \(T>70\, ^\circ{\rm C}\), with an accuracy of < 0.005 °C for a day or more. To solve this problem, authors proposed a new type of 87Rb absorption cell with two dissimilar anti-relaxation (AR) components (wall coating + buffer gas, 40Ar) and created a special physical setup for optical spin pumping of 87Rb atoms at the microwave magnetic resonance frequency, \(\nu \sim \;6.834\,\;{\text{GHz}}\), with a resolution \(0.01 \,\mathrm{H}\mathrm{z}\). Investigations have shown TFS \(\sim 1.4 \cdot 10^{{ - 12}} /\;{{^\circ }} {\text{C}}\) in significantly expanded (by an order of magnitude) zone, \(\Delta T\) ≃ \(5 \left(\pm 1\right)\,\, ^\circ{\rm C} ,\) in the operating temperature range of \(\left( {35 \div 41} \right)\;^{ \circ } {\text{C}},\) which is ensured inside a satellite, for example. The simultaneous effect of AR-components causes the maximum mutual compensation of temperature frequency shifts in the extended ∆T zone. The experimental data show the possibility realizing daily frequency instability \(\sigma _{y} \sim 1 \cdot 10^{{ - 14}}\) of the on-board atomic clock on 87Rb cell with two dissimilar AR-components (wall coating + inert gas, 40Ar).
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Pestov, E.N., Besedina, A.N., Pestov, D.E. et al. On Realization of an Extremely Small Shift of MR Frequency in a Wide Range of Operating Temperatures in Rubidium Atomic Clock on 87Rb Cell with Two Anti-Relaxation Components (Coating + Inert Gas, 40Ar). Appl Magn Reson 51, 195–204 (2020). https://doi.org/10.1007/s00723-019-01186-w
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DOI: https://doi.org/10.1007/s00723-019-01186-w