Lanthanide Doped Nanoparticles for Low Threshold Upconverting Microlasers
- Publication Type:
- Thesis
- Issue Date:
- 2022
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Lasers with small physical dimension at micro or nanoscale enable emerging applications of optoelectronic nanoscience and nanotechnologies, due to the miniatured size. However, the reduced cavity size leads to increased optical losses, and greatly increases the lasing emissions threshold. Lanthanide doped upconversion nanoparticles with ultra-long radiative lifetimes that benefit the excited energy accumulation for population inversion, are developed for micro lasing emissions. The outstanding frequency conversion properties of upconversion nanoparticles provide numerous opportunities for fantastic applications. Herein, we focus on the design and construction of efficient upconverting gain media for continuous wave (CW) pumped room temperature low threshold lasing emission. The efficient lanthanide doped gain media and coupling strategies for upconverting microlaser are investigated. Powerful strategy for excited state energy accumulation to achieve population inversion is explored. By employing microscale WGM cavities and homogenous coating architecture, lasing emissions with threshold that about two orders of magnitude lower than the recently reports are achieved. What’s more, single upconversion nanoparticle is verified to achieve lasing emission when coupled with a microcavity. And temperature dependent mode shifting promotes the potential application of in-situ temperature sensing and monitoring. Moreover, energy migration modulated upconversion nanoparticles with tri-phosphor emissions are firstly employed for white lasing emissions.
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