Frequency upconverted lasing of nanocrystal quantum dots in microbeads
2009; American Institute of Physics; Volume: 95; Issue: 18 Linguagem: Inglês
10.1063/1.3242352
ISSN1520-8842
AutoresChunfeng Zhang, Fan Zhang, An Cheng, Brian R. Kimball, Andrew Y. Wang, Jian Xu,
Tópico(s)Photonic Crystals and Applications
ResumoStable, frequency upconverted lasing of semiconductor nanocrystal quantum dots was demonstrated in silica microbeads under two-photon pumping conditions. Upon infrared excitation, the stimulated emission of the nanocrystal-doped microbeads exhibits sharp peaks at λ∼610 nm with narrow line widths of ≤1 nm. The lasing action has been attributed to the biexciton gain coupled to the whispering gallery modes in spherical cavities, as confirmed by time-resolved photoluminescence spectra. The lasing lifetime characterized in term of pulse numbers (∼106 pulses) was two orders of magnitude longer than that of the dye salt-based two-photon lasers.
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