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Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
Research Interests
  • Molecular modeling and simulation, statistical thermodynamics, molecular physics

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Continuous-wave upconversion lasing with a sub-10 W cm(-2) threshold enabled by atomic disorder in the host matrix

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Title
Continuous-wave upconversion lasing with a sub-10 W cm(-2) threshold enabled by atomic disorder in the host matrix
Author
Moon, Byeong-SeokLee, Tae KyungJeon, Woo CheolKwak, Sang KyuKim, Young-JinKim, Dong-Hwan
Issue Date
2021-07
Publisher
NATURE RESEARCH
Citation
NATURE COMMUNICATIONS, v.12, no.1, pp.4437
Abstract
Microscale lasers efficiently deliver coherent photons into small volumes for intracellular biosensors and all-photonic microprocessors. Such technologies have given rise to a compelling pursuit of ever-smaller and ever-more-efficient microlasers. Upconversion microlasers have great potential owing to their large anti-Stokes shifts but have lagged behind other microlasers due to their high pump power requirement for population inversion of multiphoton-excited states. Here, we demonstrate continuous-wave upconversion lasing at an ultralow lasing threshold (4.7Wcm(-2)) by adopting monolithic whispering-gallery-mode microspheres synthesized by laser-induced liquefaction of upconversion nanoparticles and subsequent rapid quenching ("liquid-quenching"). Liquid-quenching completely integrates upconversion nanoparticles to provide high pump-to-gain interaction with low intracavity losses for efficient lasing. Atomic-scale disorder in the liquid-quenched host matrix suppresses phonon-assisted energy back transfer to achieve efficient population inversion. Narrow laser lines were spectrally tuned by up to 3.56nm by injection pump power and operation temperature adjustments. Our low-threshold, wavelength-tunable, and continuous-wave upconversion microlaser with a narrow linewidth represents the anti-Stokes-shift microlaser that is competitive against state-of-the-art Stokes-shift microlasers, which paves the way for high-resolution atomic spectroscopy, biomedical quantitative phase imaging, and high-speed optical communication via wavelength-division-multiplexing. Upconversion microlasers present a lot of advantages but also require high pumping powers. Here the authors present a high-performing microlaser based on anti-Stokes-shift in upconversion nanoparticles synthesized using a technique of liquid quenching.
URI
https://scholarworks.unist.ac.kr/handle/201301/53865
URL
https://www.nature.com/articles/s41467-021-24751-z
DOI
10.1038/s41467-021-24751-z
ISSN
2041-1723
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