Selection of papers presented at the symposium MPLP-2018
Impact of microwave-field inhomogeneity in an alkali vapour cell using Ramsey double-resonance spectroscopy
W. Moreno, M. Pellaton, C. Affolderbach, N. Almat, M. Gharavipour, F. Gruet, G. Mileti
Laboratoire Temps-Fréquence, Institut de Physique, Université de Neuchâtel, Switzerland
We numerically and experimentally evaluate the impact of the inhomogeneity of the microwave field in the cavity used to perform double-resonance (DR) Ramsey spectroscopy in a buffer gas alkali vapour cell. The Ramsey spectrum is numerically simulated using a simple theoretical model and taking into account the field distribution in a magnetron-type microwave resonator. An experimental evaluation is performed using a DR pulsed optically pumped (POP) atomic clock. It is shown that the sensitivity to the microwave power of the DR POP clock can be reproduced from the combination of two inhomogeneities across the vapour cell: microwave field inhomogeneity and atomic ground-state resonance frequency inhomogeneity. Finally, we present the existence of an optimum operation point for which the microwave power sensitivity of our DR POP clock is reduced by two orders of magnitude. It leads into a long-term frequency stability of 1 × 10-14.
microwave-power frequency shift, microwave field amplitude inhomogeneity, double-resonance clock, POP clock, rubidium, magnetron-type cavity, vapour cell.
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Quantum Electronics, 2019, 49:3, 293–297
W. Moreno, M. Pellaton, C. Affolderbach, N. Almat, M. Gharavipour, F. Gruet, G. Mileti, “Impact of microwave-field inhomogeneity in an alkali vapour cell using Ramsey double-resonance spectroscopy”, Kvantovaya Elektronika, 49:3 (2019), 293–297 [Quantum Electron., 49:3 (2019), 293–297]
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