Frequency upconverted lasing of nanocrystal quantum dots in microbeads

Chunfeng Zhang, Fan Zhang, An Cheng, Brian Kimball, Andrew Y. Wang, Jian Xu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Stable, 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.

Original languageEnglish (US)
Article number183109
JournalApplied Physics Letters
Volume95
Issue number18
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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