  We present a micrometer-resolution millimeter-field-of-view stress imaging
method for diamonds containing a thin surface layer of nitrogen vacancy (NV)
centers. In this method, we reconstruct stress tensor elements over a
two-dimensional field of view from NV optically-detected magnetic resonance
(ODMR) spectra. We use this technique to study how stress inhomogeneity affects
NV magnetometry performance, and show how NV stress imaging is a useful and
direct way to assess these effects. This new tool for mapping stress in diamond
will aid optimization of NV-diamond sensing, with wide-ranging applications in
the physical and life sciences.
