Diamond Laser Magnetometer Achieves 100% Optical Contrast
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Phys.org reported on October 22, 2026, that researchers at Fraunhofer IAF demonstrated a diamond NV-center laser-threshold magnetometer. The system achieved 100% optical contrast and coherent laser readout of up to 50 mW. Under photon-shot-noise-limited conditions, the sensitivity of each of the three components of the magnetic field vector can be below 400 fT/√Hz. Compared with conventional NV fluorescence sensors and vapor-cell magnetometers, the system improved the ratio of sensitivity limit to dynamic range by up to 590 times while retaining vector measurement capability.
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- Phys.org Optics & PhotonicsPicksFraunhofer IAF Diamond Laser System Achieves 100% Optical Contrast for Magnetic-Field Readout
Researchers at Fraunhofer IAF have demonstrated a diamond NV-center laser-threshold magnetometer achieving 100% optical contrast and coherent laser readout of up to 50 mW. Under photon-shot-noise-limited conditions, the sensitivity of each of the three components of the magnetic-field vector can be below 400 fT/√Hz. Compared with conventional NV fluorescence sensors and vapor-cell magnetometers, the system improves the ratio of the sensitivity limit to dynamic range by up to 590 times while retaining vector measurement capability.
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