All optical readout scheme for photoluminescence based magnetic field sensors

Abstract

An improvement on a concept for all optical mag- netometry using nitrogen vacancies in diamond is presented. The concept is based on the fluorescence attenuation of optically pumped nitrogen vacancies by magnetic fields up to ≈ 50 mT. The attenuation is registered by modulating the pumping power to generate a constant signal at a photodetector. A sensitivity of $2.6\mu {\text{T}}/\sqrt {{\text{Hz}}} $ at a sampling frequency of 500 Hz is achieved.