CdSxSe1-x/ZnS semiconductor nanocrystal laser with sub 10kW/cm² threshold and 40nJ emission output at 600 nm

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A colloidal quantum dot laser emitting at 600 nm with a sub 10kW/cm2 threshold at 5ns pulse pumping is reported. The device has a second order distributed feedback cavity for vertical emission and incorporates a bilayer planar waveguide structure based on a film of yellow-orange alloyed-core/shell CdSxSe1-x/ZnS quantum dots over-coated with polyvinyl alcohol. A study of the amplified spontaneous regime indicates that the quantum dot gain region behaves like a quasi-three level system and that the bilayer structure design increases the modal gain compared to a single layer of quantum dots. An output of 40nJ per pulse is measured for a total pump-to-signal efficiency above threshold of 3%.
Original languageEnglish
JournalOptics Express
Issue number2
Early online date10 Dec 2015
Publication statusPublished - 25 Jan 2016


  • semiconductor nanocrystal laser
  • quantum dots
  • CdSxSe1-x/ZnS

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