The electromagnetic field from an ordered array of emitters can interfere giving rise to effective emitter-emitter interactions. We study the interaction of light with an array of thulium ions in microring lithium niobate resonators. We show that rare-earth ions arranged into an ordered array can collectively emit light into the micro-resonator. We achieve this via deterministic implantation of ions into the nanofabricated lithium niobate on insulator micro-ring resonators. We show that at cryogenic temperatures, both Purcell enhancement and cooperative enhancement of light emission can be observed in these structures.
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