Waveform reconstruction with a Cs based free-induction-decay magnetometer

Hunter, Dominic and Jiménez-Martínez, Ricardo and Herbsommer, Juan and Ramaswamy, Srinath and Li, Wen and Riis, Erling (2018) Waveform reconstruction with a Cs based free-induction-decay magnetometer. Optics Express, 26 (23). pp. 30523-30531. ISSN 1094-4087 (https://doi.org/10.1364/OE.26.030523)

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Abstract

We demonstrate an optically pumped magnetometer (OPM) operated in a free-induction-decay (FID) configuration that is capable of tracking oscillating magnetic signals in the presence of a 50 uT static field. Excellent waveform reconstruction is demonstrated for low frequency modulations with respect to the Nyquist limited bandwidth. A 100 pT oscillation was successfully reconstructed using signal averaging, and an optimum sensitivity of 3.9 pT/sqrt{Hz} was measured from the spectrum of the residuals relative to the sinusoidal fit. The impact of the pump-probe repetition rate and spin depolarization on the frequency response of the sensor is investigated in detail using miniaturized vapor cell technology, with the (-3 dB) bandwidths residing beyond the Nyquist limit in each case. We also discuss technical limitations associated with the magnetometer when exposed to oscillating fields of sufficiently high amplitude or frequency. This is discussed in the context of potential distortions arising in the reproduced signals, induced by frequency-modulation (FM) and aliasing artefacts.

ORCID iDs

Hunter, Dominic ORCID logoORCID: https://orcid.org/0000-0003-4177-6027, Jiménez-Martínez, Ricardo, Herbsommer, Juan, Ramaswamy, Srinath, Li, Wen and Riis, Erling ORCID logoORCID: https://orcid.org/0000-0002-3225-5302;
  • Item type:Article
    ID code:65854
    Dates:
    Date
    Event
    12 November 2018
    Published
    7 November 2018
    Published Online
    23 October 2018
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:23 Oct 2018 09:11
    Last modified:11 Nov 2024 12:08
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65854
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