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Laser-threshold magetometry using the negatively charged nitrogen-vacancy(NV-) centre in diamond as a gain medium has been proposed as a technique todramatically enhance the sensitivity of room-temperature magnetometry. Weexperimentally explore a diamond-loaded open tunable fibre-cavity system as apotential contender for the realization of lasing with NV- centres. We observeamplification of the transmission of a cavity-resonant seed laser at 721 nmwhen the cavity is pumped at 532 nm, and attribute this to stimulated emission.Changes in the intensity of spontaneously emitted photons accompany theamplification, and a qualitative model including stimulated emission andionisation dynamics of the NV- centre captures the dynamics in the experimentvery well. These results highlight important considerations in the realizationof an NV- laser in diamond.

Amplification by stimulated emission of nitrogen vacancy centres in a diamond-loaded fibre cavity