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Microsphere whispering-gallery-mode laser using HgTe quantum dots

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5 Author(s)
Shopova, S.I. ; Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078-3072 ; Farca, G. ; Rosenberger, A.T. ; Wickramanayake, W.M.S.
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Ultralow-threshold continuous-wave lasing is achieved at room temperature in a fused-silica microsphere that is coated with HgTe quantum dots (colloidal nanoparticles). The 830 nm pump input and HgTe microlaser output are efficiently coupled into and out of whispering-gallery modes by tapered fibers. Lasing occurs at wavelengths ranging from 1240 to 1780 nm, depending on the size and composition of the quantum dots (HgCdTe is also used). A linear fit to the data determines the lowest observed threshold pump power to be 0±2 μW.

Published in:

Applied Physics Letters  (Volume:85 ,  Issue: 25 )