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Taking upconversion to lase in microcavity

Stable, sharp-bandwidth and upconverted stimulated emissions are generated from a 5-μm polystyrene cavity pumped by a low-power continuous-wave excitation.

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Fig. 1: Upconverting μ-cavity laser using ‘energy looping’ upconversion nanoparticles as gain medium.


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Correspondence to Gungun Lin or Dayong Jin.

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Lin, G., Jin, D. Taking upconversion to lase in microcavity. Nature Nanotech 13, 534–536 (2018).

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