We give instructions for the construction and operation of a simple apparatusfor performing optically detected magnetic resonance measurements on diamondsamples containing high concentrations of nitrogen-vacancy (NV) centers. EachNV center has a spin degree of freedom that can be manipulated and monitored bya combination of visible and microwave radiation. We observe Zeeman shifts inthe presence of small external magnetic fields and describe a simple method tooptically measure magnetic field strengths with a spatial resolution of severalmicrons. The activities described are suitable for use in an advancedundergraduate lab course, powerfully connecting core quantum concepts tocutting edge applications. An even simpler setup, appropriate for use in moreintroductory settings, is also presented.
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