Abstract Laser threshold magnetometry using the negatively charged nitrogen-vacancy (NV−) centre in diamond as a gain medium has been proposed as a technique to dramatically enhance the sensitivity of room-temperature magnetometry. We experimentally explore a diamond-loaded open tunable fibre-cavity system as a potential contender for the realisation of lasing with NV− centres. We observe amplification of the transmission of a cavity-resonant seed laser at 721 nm when the cavity is pumped at 532 nm and attribute this to stimulated emission. Changes in the intensity of spontaneously emitted photons accompany the amplification, and a qualitative model including stimulated emission and ionisation dynamics of the NV− centre captures the dynamics in the experiment very well. These results highlight important considerations in the realisation of an NV− laser in diamond.

中文翻译：

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在载有金刚石的纤维腔中通过氮空位中心的受激发射放大

摘要 使用金刚石中带负电荷的氮空位 (NV-) 中心作为增益介质的激光阈值磁力计已被提议作为一种显着提高室温磁力计灵敏度的技术。我们通过实验探索了一种装载金刚石的开放式可调光纤腔系统，作为实现具有 NV− 中心的激光的潜在竞争者。当腔在 532 nm 泵浦时，我们观察到腔谐振种子激光器在 721 nm 的传输放大，并将其归因于受激发射。自发发射光子强度的变化伴随着放大，包括 NV− 中心的受激发射和电离动力学在内的定性模型很好地捕捉了实验中的动力学。