Compact optically pumped magnetometer light source stabilization with regulated feedbacks

Article Neurosciences

Cross-Axis projection error in optically pumped magnetometers and its implication for magnetoencephalography systems

Amir Borna et al.

Summary: The study demonstrates that significant cross-axis projection errors can be introduced into the output signal of optically pumped magnetometers, leading to a degradation in localization and calibration accuracy of the system.

NEUROIMAGE (2022)

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Article Optics

Optimized gas pressure of an Rb vapor cell in a single-beam SERF magnetometer

Yaxiang Wang et al.

Summary: In this study, a theoretical and experimental investigation on a single-beam spin-exchange relaxation-free magnetometer in Rb-87 vapor cells under different nitrogen gas pressures was conducted. The spin relaxation rate and the pumping light intensity were found to limit the magnetic sensitivity. The optimal pumping light intensity and gas pressure were determined based on theoretical analysis and experimental results. The experimental demonstration achieved a magnetic field sensitivity of 8.89 fT/root Hz in the single-beam configuration.

OPTICS EXPRESS (2022)

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Article Optics

Large-aperture single-mode 795 nm VCSEL for chip-scale nuclear magnetic resonance gyroscope with an output power of 4.1 mW at 80 °C

Yinli Zhou et al.

Summary: Transverse optical confinement in oxide-confined vertical-cavity surface-emitting lasers (VCSELs) is influenced by the thickness and position of the oxide layer relative to the standing wave. Modifying the structure reduces overlap and refractive index difference, leading to fewer transverse modes and increased mode extension beyond the oxide aperture.

OPTICS EXPRESS (2022)

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Article Optics

Passive laser power stabilization via an optical spring

Torrey Cullen et al.

Summary: This letter proposes a method using the optical spring effect to passively stabilize the classical power fluctuations of a laser beam. Through a proof of principle experiment, it demonstrates significant reduction of relative power noise within a certain bandwidth. This method provides new insights for the development of high power laser stability techniques.

OPTICS LETTERS (2022)

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Review Clinical Neurology

Wearable OPM-MEG: A changing landscape for epilepsy

Mangor Pedersen et al.

Summary: Magnetoencephalography with optically pumped magnometers (OPM-MEG) is a wearable system that can record neuronal activity with high temporal and spatial resolution. Compared to conventional techniques, OPM-MEG has more advantages and shows potential in epilepsy surgery evaluation.

EPILEPSIA (2022)

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Review Neurosciences

Magnetoencephalography with optically pumped magnetometers (OPM-MEG): the next generation of functional neuroimaging

Matthew J. Brookes et al.

Summary: A new generation of MEG technology using optically pumped magnetometers (OPMs) addresses the limitations of current MEG instrumentation, offering improved data quality, adaptability, motion robustness, and a simplified imaging platform. This has far-reaching implications for neuroscience.

TRENDS IN NEUROSCIENCES (2022)

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Article Multidisciplinary Sciences

A 90-channel triaxial magnetoencephalography system using optically pumped magnetometers

Molly Rea et al.

Summary: Magnetoencephalography (MEG) is a noninvasive technique that measures the magnetic fields generated by neural networks. Conventional MEG instruments use cryogenic field-sensing technologies, while a new approach called optically pumped magnetometers MEG (OPM-MEG) uses lightweight sensors with higher sensitivity and resolution. This study introduces a novel triaxial OPM-MEG system and demonstrates its potential for high-performance functional neuroimaging by mapping motor function during a handwriting task.

ANNALS OF THE NEW YORK ACADEMY OF SCIENCES (2022)

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Article Optics

Reaching fiber-laser coherence in integrated photonics

Bohan Li et al.

Summary: The hybrid integrated laser achieved a frequency noise floor of 0.006 Hz(2)/Hz at 4 MHz offset, with a Lorentzian linewidth below 40 mHz, and frequency noise of 200 Hz(2)/Hz at 100 Hz offset. This performance exceeds commercially available, high-performance fiber lasers and marks a milestone in integrated photonics development.

OPTICS LETTERS (2021)

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Article Physics, Applied

Single-beam three-axis optically pumped magnetometers with sub-100 femtotesla sensitivity

Wei Xiao et al.

Summary: The study presents a single-beam three-axis parametric-resonance magnetometer operated in near-zero fields, capable of extracting three components of the magnetic field in real time. It demonstrates excellent magnetic-field sensitivities and compact structure, making it ideal for applications requiring highly sensitive measurements of the vector components of magnetic fields.

APPLIED PHYSICS EXPRESS (2021)

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Article Neurosciences

Measuring functional connectivity with wearable MEG

Elena Boto et al.

Summary: Optically-pumped magnetometers (OPMs) have the potential to improve data quality and wearability in magnetoencephalography (MEG), with results showing high similarity to state-of-the-art cryogenic MEG systems. This indicates the potential for OPMs to ultimately replace traditional sensors for MEG measurements.

NEUROIMAGE (2021)

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Article Optics

High stability laser locking to an optical cavity using tilt locking

Namisha Chabbra et al.

Summary: This paper presents the first demonstration of high performance tilt locking, a method of stabilizing laser frequency to an optical reference cavity using a spatial-mode readout technique. The experiment achieved promising performance in the 100 mu Hz-1 Hz band, surpassing the requirements of the GRACE Follow-On laser ranging interferometer. Tilt locking offers benefits such as high sensitivity, low cost, and simple implementation for future applications requiring high performance laser locking.

OPTICS LETTERS (2021)

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Article Optics

VCSEL frequency stabilization for optically pumped magnetometers

Yeguang Yan et al.

Summary: By simultaneously adjusting VCSEL injection current and temperature, the optical system of optically pumped magnetometers (OPMs) has achieved improved stability with a frequency stability of 2 x 10-7 and intensity noise of 1 x 10-6 V/Hz1/2, effectively suppressing OPM noise without the need for additional sensor probe parts.

CHINESE OPTICS LETTERS (2021)

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Article Physics, Applied