Here you can find abbreviations and acronyms that are frequency used within this collaborative research center.OPM stands for optically pumped magnetometer, a highly sensitive device used to measure magnetic fields. It operates based on principles from quantum physics and atomic interactions with light.
An optically pumped magnetometer typically uses a vapor of alkali atoms (such as rubidium or cesium) contained in a small cell. These atoms are first “pumped” into a specific energy state using polarized laser light. This process aligns the spins of the atoms, creating a well-defined quantum state.
When an external magnetic field is present, it causes the atomic spins to precess (rotate) at a frequency that depends on the strength of that magnetic field. By shining another beam of light through the vapor and analyzing how the atoms affect this light, the device can detect changes in the spin state. From these changes, the magnetic field strength can be calculated with extremely high precision.
OPMs are known for their exceptional sensitivity, often capable of detecting magnetic fields much weaker than the Earth’s magnetic field. Unlike traditional magnetometers, they do not require cryogenic cooling, making them more compact and practical for many applications.
They are widely used in fields such as:
- Medical imaging (e.g., magnetoencephalography to measure brain activity)
- Geophysics (detecting mineral deposits or underground structures)
- Fundamental physics research (studying atomic behavior and quantum effects)
- Navigation and defense technologies
In summary, an optically pumped magnetometer is a cutting-edge sensor that leverages the interaction between light and atoms to measure magnetic fields with remarkable accuracy.
