Skip to main content

Research Repository

Advanced Search

All Outputs (10)

Alignment-Based Optically Pumped Magnetometer Using a Buffer-Gas Cell (2023)
Journal Article
Rushton, L. M., Elson, L., Meraki, A., & Jensen, K. (2023). Alignment-Based Optically Pumped Magnetometer Using a Buffer-Gas Cell. Physical Review Applied, 19(6), Article 064047. https://doi.org/10.1103/PhysRevApplied.19.064047

Alignment-based optically pumped magnetometers (OPMs) are capable of measuring oscillating magnetic fields with high sensitivity in the fT/Hz range. Until now, alignment-based magnetometers have only used paraffin-coated vapour cells to extend the sp... Read More about Alignment-Based Optically Pumped Magnetometer Using a Buffer-Gas Cell.

Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D2 Line (2023)
Journal Article
Stærkind, H., Jensen, K., Müller, J. H., Boer, V. O., Petersen, E. T., & Polzik, E. S. (2023). Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D2 Line. Physical Review X, 13(2), Article 021036. https://doi.org/10.1103/PhysRevX.13.021036

Transitions between the extreme angular-momentum states of alkali D lines hold the potential for enabling accurate high-field optical magnetometry because of their very simple magnetic field dependence described only by a linear and a quadratic term,... Read More about Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D2 Line.

Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements (2022)
Journal Article
Rushton, L. M., Pyragius, T., Meraki, A., Elson, L., & Jensen, K. (2022). Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements. Review of Scientific Instruments, 93(12), Article 125103. https://doi.org/10.1063/5.0102402

Electrically conductive objects can be detected using the principle of electromagnetic induction, where a primary oscillating magnetic field induces eddy currents in the object, which in turn produce a secondary magnetic field that can be measured wi... Read More about Unshielded portable optically pumped magnetometer for the remote detection of conductive objects using eddy current measurements.

Detection and Characterisation of Conductive Objects Using Electromagnetic Induction and a Fluxgate Magnetometer (2022)
Journal Article
Elson, L., Meraki, A., Rushton, L. M., Pyragius, T., & Jensen, K. (2022). Detection and Characterisation of Conductive Objects Using Electromagnetic Induction and a Fluxgate Magnetometer. Sensors, 22(16), Article 5934. https://doi.org/10.3390/s22165934

Eddy currents induced in electrically conductive objects can be used to locate metallic objects as well as to assess the properties of materials non-destructively without physical contact. This technique is useful for material identification, such as... Read More about Detection and Characterisation of Conductive Objects Using Electromagnetic Induction and a Fluxgate Magnetometer.

Small Animal Biomagnetism Applications (2022)
Book Chapter
Jensen, K., Bentzen, B. H., & Polzik, E. S. (2022). Small Animal Biomagnetism Applications. In Flexible High Performance Magnetic Field Sensors: On-Scalp Magnetoencephalography and Other Applications (33-48). Springer International Publishing. https://doi.org/10.1007/978-3-031-05363-4_3

The functioning of the human brain, nervous system, and heart is based on the conduction of electrical signals. These electrical signals also create magnetic fields which extend outside the human body. Highly sensitive magnetometers, such as supercon... Read More about Small Animal Biomagnetism Applications.

All-optical spin locking in alkali-metal-vapor magnetometers (2022)
Journal Article
Bao, G., Kanta, D., Antypas, D., Rochester, S., Jensen, K., Zhang, W., …Budker, D. (2022). All-optical spin locking in alkali-metal-vapor magnetometers. Physical Review A, 105(4), https://doi.org/10.1103/PhysRevA.105.043109

The nonlinear Zeeman effect can induce splittings and asymmetries of magnetic-resonance lines in the geophysical magnetic-field range. We demonstrate an all-optical scheme, based on spin locking, to suppress the nonlinear Zeeman effect. This scheme a... Read More about All-optical spin locking in alkali-metal-vapor magnetometers.

A high performance active noise control system for magnetic fields (2021)
Journal Article
Pyragius, T., & Jensen, K. (2021). A high performance active noise control system for magnetic fields. Review of Scientific Instruments, 92(12), Article 124702. https://doi.org/10.1063/5.0062650

We present a system for active noise control of environmental magnetic fields based on a filtered-x least mean squares algorithm. The system consists of a sensor that detects the ambient field noise and an error sensor that measures the signal of int... Read More about A high performance active noise control system for magnetic fields.

Detection of low-conductivity objects using eddy current measurements with an optical magnetometer (2019)
Journal Article
Jensen, K., Zugenmaier, M., Arnbak, J., Stærkind, H., Balabas, M. V., & Polzik, E. S. (2019). Detection of low-conductivity objects using eddy current measurements with an optical magnetometer. Physical Review Research, 1(3), Article 033087. https://doi.org/10.1103/physrevresearch.1.033087

Detection and imaging of an electrically conductive object at a distance can be achieved by inducing eddy currents in it and measuring the associated magnetic field. We have detected low-conductivity objects with an optical magnetometer based on room... Read More about Detection of low-conductivity objects using eddy current measurements with an optical magnetometer.

Quantum back-action-evading measurement of motion in a negative mass reference frame (2017)
Journal Article
Møller, C. B., Thomas, R. A., Vasilakis, G., Zeuthen, E., Tsaturyan, Y., Balabas, M., …Polzik, E. S. (2017). Quantum back-action-evading measurement of motion in a negative mass reference frame. Nature, 547, 191-195. https://doi.org/10.1038/nature22980

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Quantum mechanics dictates that a continuous measurement of the position of an object imposes a random quantum back-Action (QBA) perturbation on its momentum. This ran... Read More about Quantum back-action-evading measurement of motion in a negative mass reference frame.

Cavity-enhanced room-temperature magnetometry using absorption by nitrogen-vacancy centers in diamond (2014)
Journal Article
Jensen, K., Leefer, N., Jarmola, A., Dumeige, Y., Acosta, V., Kehayias, P., …Budker, D. (2014). Cavity-enhanced room-temperature magnetometry using absorption by nitrogen-vacancy centers in diamond. Physical Review Letters, 112(16), 160802. https://doi.org/10.1103/PhysRevLett.112.160802

We demonstrate a cavity-enhanced room-temperature magnetic field sensor based on nitrogen-vacancy centers in diamond. Magnetic resonance is detected using absorption of light resonant with the 1042 nm spin-singlet transition. The diamond is placed in... Read More about Cavity-enhanced room-temperature magnetometry using absorption by nitrogen-vacancy centers in diamond.