Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session S05: Magnetometry |
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Chair: Szymon Pustelny, Jagiellonian University Room: 205 |
Thursday, June 8, 2023 10:30AM - 10:42AM |
S05.00001: Digital alkali spin maser for measurement of geophysical fields Stuart Ingleby, Paul F Griffin, Terry Dyer, Marcin Mrozowski, Erling Riis The creation of a self-oscillating alkali metal spin maser by radio-frequency feedback has found longstanding use for optically pumped magnetometry, and offers high dynamic range and bandwidth. These features are of particular value in real-world unshielded applications, in which the magnetometer must operate in the presence of rapidly changing geophysical fields. The key to creating the alkali spin maser system is phase-matching to achieve coherent feedback and amplification of the radio-frequency resonance. We have demonstrated a system in which this condition for resonant spin precession is met by digital signal processing integrated into the spin maser feedback loop. The magnetometer sensor head is built using a chip-scale vertical-cavity surface-emitting laser (VCSEL) and a microfabricated dual-pass caesium vapour cell. The digital feedback loop utilises matched dual finite-impulse response (FIR) filters to achieve a real-time Hilbert transform and generation of phase-coherent feedback to the alkali spin system. This system is optimised for and demonstrated in a 50 μT bias field, achieving sensor bandwidth of 10 kHz and Cramér-Rao lower bound-limited resolution of 50 fT at 1 s sampling cadence. |
Thursday, June 8, 2023 10:42AM - 10:54AM |
S05.00002: Optimization of performance for an EIT-based vector magnetometer. Mario Gonzalez Maldonado, Alex Toyryla, Isaac Fan, Yang Li, Ying-Ju Wang, John E Kitching, Jamie McKelvy, Andrey B Matsko, Eugeniy Mikhailov, Irina B Novikova In this work we present the advance on the experimental realization of a vector atomic magnetometer based on electromagnetically induced transparency (EIT) resonances. Magnetic fields modify the separation between EIT spectrum peaks, independently of their orientation, allowing for magnetic field magnitude measurements. However, the resonance amplitudes depend on the field orientation relative to the light wave vector and polarization direction, making this system capable of vector measurements. Here we report our evaluation of the short-term stability and sensitivity of our prototype using a magnetically isolated 100mm3 vapor cell of hot 87Rb atoms. We show an achievable scalar stability below 10 pT/rtHz in the 1Hz-100Hz bandwidth. An unsupervised machine learning technique is used to analyze the amplitude of the EIT resonances and determine the magnetic field orientation with a sensitivity better than 1°. |
Thursday, June 8, 2023 10:54AM - 11:06AM |
S05.00003: A compact atomic co-magnetometer for moving MEGs recording Yao Chen, Libo Zhao, Zhuangde Jiang Due to its very high sensitivity, atomic magnetometer could be utilized for brain magnetic field measurement. Moreover, the room temperature magnetometer could be integrated to a helmet and could be utilized for moving MEGs measurement. The moving MEGs recording could study several brain's functions such as space navigation. However, the moving related fluctuation background magnetic field could cause very large background magnetic field noise. Here we will describe an atomic co-magnetometer which could be potential for the moving MEGs recording. The nuclear spins utilized in the atomic co-magnetometer could self-compensate the background magnetic field noise while retain the co-magnetometer's sensitivity to the brain magnetic field whose frequencies are higher than 5Hz. Here we will show our design of the compact atomic co-magnetometer which could be mounted to the head. The single beam absorption design could greatly reduce the volume of the sensor head. The co-magnetometer also requires three direction magnetic fields for the operation. We chose to use the bi-planar coil system for the design and the magnetic field gradient produces by the coils are studied. The bi-planar coil system could confine the electricity of the coils in only two paralleled plane and produces three dimensions of magnetic field. Thus, it is quite suitable for the compact design of the atomic co-magnetometer. A model was developed to measure the gradients of the coils and an optimized bi-planar coil system was developed to improve the uniformity of the magnetic field. |
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