We show ultra-low-threshold lasing due to morphology-dependent resonances from an europium (Eu)-chelate-doped microdroplet with ∼90 μm diameter. Spectra and spatial images between lasing and nonlasing are exhibited with comparison. Temporal responses are discussed from the viewpoint of the faster (direct) and slower (indirect) transitions in Eu chelates.
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Taniguchi et al. (1995) studied this question.