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Coherent sources exploiting the stimulated emission of non-equilibriumquantum systems, i.e. gain media, have proven indispensable for advancingfundamental research and engineering. The operating electromagnetic bands ofsuch coherent sources have been continuously enriched for increasingdemands.Nevertheless, for a single bench top coherent source, simultaneousgeneration of radiation in multiple bands, especially when the bands are widelyseparated, present formidable challenges with a single gain medium. Here, wepropose a mechanism of simultaneously realizing the stimulated emission ofradiation in the visible and microwave bands, i.e. lasing and masing actions,at ambient conditions by utilizing photoexcited singlet and triplet states ofthe pentacene molecules that are doped in p-terphenyl. The possibility isvalidated by the observed amplified spontaneous emission (ASE) at 645 nm with anarrow linewidth around 1 nm from the pentacene-doped p-terphenyl crystal usedfor masing at 1.45 GHz and consolidated by a 20 fold lower threshold of ASEcompared to the reported masing threshold. The overall threshold of thepentacene-based multiband coherent source can be optimized by appropriatealignment of the pump-light polarization with the pentacene's transition dipolemoment. Our work not only shows a great promise on immediate realization ofmultiband coherent sources but also establishes an intriguing solid-stateplatform for fundamental research of quantum optics in multiple frequencydomains.

Towards simultaneous coherent radiation in the visible and microwave bands with doped molecular crystals