We explore an approach for optically pumping a body of optically dense magnetic material. This challenge arises in time-resolved electron paramagnetic resonance (TREPR), triplet-based dynamic nuclear polarisation (DNP), and cavity QED. Crystals of pentacene-doped p-terphenyl were grown around variously shaped ends of optical waveguides, through which pump light could be injected deeply into the crystal. When incorporated into a maser as the gain medium, we found that, compared to conventional side-pumping, 11 times less pump beam intensity was needed to reach the masing threshold and 54 times more pulse energy could be absorbed by the gain medium without damage, resulting in a record peak output power of -5 dBm.

中文翻译：

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适用于室温masers，时间分辨EPR，三重态DNP和利用强耦合的量子引擎的有创光泵浦

我们探索了一种光学泵浦光学致密磁性材料的方法。时间分辨电子顺磁共振（TREPR），基于三重态的动态核极化（DNP）和腔体QED引起了这一挑战。并五苯掺杂的对三联苯晶体在光波导的各种形状的末端周围生长，通过泵浦光可以将泵浦光深深注入晶体中。当我们将其作为增益介质掺入maser中时，我们发现，与传统的侧面泵浦相比，达到massing阈值所需的泵浦光束强度要低11倍，并且增益介质可以吸收54倍以上的脉冲能量而不会造成损坏，导致创纪录的-5 dBm峰值输出功率。