Gupta, N; Klein, H; Huang, G; Ince, R; Ashraf, N; Gokay, U; Nicholls, L; Haji, M (2024) Optimisation of Double Resonance Optically Pumped Rb Atomic Clocks Using a Reconfigurable Physics Package Testbed. In: 2024 European Frequency and Time Forum (EFTF), 25-27 June 2024, Neuchâtel, Switzerland.

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Abstract

We report on the optimisation of a double resonance optically pumped (DROP) rubidium (Rb) atomic clock using a reconfigurable physics package testbed. The testbed can incorporate numerous sizes and variations of the following components: optical sources, Rb vapour cells and microwave cavities. DROP measurements were carried out for a range of different optical powers and temperatures. For one of the Rb vapour cells studied, near optimum physics package conditions were achieved with a DROP signal contrast of 8.7%, for a linewidth of 1.5 kHz, at a temperature of 75 oC, using an optical power of 25 μW. In addition, the extent of helium permeation through the walls of a commercial Rb integrated cell was determined by immersing a Rb atomic clock in pure helium at atmospheric pressure and monitoring the drift of the 10 MHz output. A fractional drift rate in normal air (with 5 ppm helium) was determined to be nearly 10-11/month.

Item Type:	Conference or Workshop Item (Paper)
Keywords:	Atomic clock, double resonance optical pumping (DROP)
Subjects:	Time and Frequency > Microwave Frequency Standards
Divisions:	Time & Frequency
Publisher:	IEEE
Identification number/DOI:	10.1109/EFTF61992.2024.10722418
Last Modified:	16 Feb 2026 11:45
URI:	https://eprintspublications.npl.co.uk/id/eprint/10279