All-in-one quantum diamond microscope for sensor characterization

Ensembles of nitrogen-vacancy (NV) centers in diamond are a leading platform for sensing and imaging magnetic fields at room temperature, in part due to advances in diamond growth. An essential step to improving diamond material involves the characterization of crystal and NV-related properties, such as strain and paramagnetic impurities, which can shift and broaden the NV resonances used for sensing. Full sample characterization through wide-field imaging enables both fast and detailed feedback for growers, along with the estimation of sensing performance before use. We present a quantum diamond microscope tailored for millimeter-scale wide-field mapping of key quantum properties of NV-diamond chips, including NV ensemble photoluminescence intensity, spin-lattice relaxation time (T1), and spin-coherence lifetimes (T2 and T2*). Our design also allows for lattice stress/strain and birefringence magnitude/angle mapping, and their in situ correlation with NV properties.