Flexible distributed-feedback colloidal quantum dot laser

Yujie Chen, Benoit Jack Eloi Guilhabert, Johannes Herrnsdorf, Yanfeng Zhang, Allan Mackintosh, Richard Pethrick, Erdan Gu, Nicolas Laurand, Martin Dawson

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23 Citations (Scopus)


Flexible distributed feedback colloidal quantum dot laser patterned by a submicron grating structure is reported. An exposed standard commercial blank digital versatile disk (DVD) was used as the mask to fabricate a submicron scale grating structure, providing a simple and low-cost approach. A UV transparent polymerisable host matrix, 1,4-cyclohexanedimethanol divinyl ether (CHDV), was then photo-cured to replicate the DVD grating structure and peeled off from the mask, resulting in a flexible grating. The thickness of the grating substrate can be controlled in the range of 50 to 300 μm. A frequency-tripled Q-switched Nd:YAG laser (5-ns pulse, 10-Hz repetition rate and 355-nm excitation wavelength) was then used to photo-pump the CQD sample. The emission evolution was investigated and a 4 mJ/cm2 lasing threshold was found, comparing favourably to other reports of CQD lasers. The polarisation of the laser emission revealed that the DFB CQD laser favours a linearly polarized (TE) emission. During the experiment, the laser performance, operating above lasing threshold at room temperature and ambient atmosphere, was stable over more than 10,000 pump pulses.
Original languageEnglish
Article number241103
Number of pages3
JournalApplied Physics Letters
Issue number24
Early online date12 Dec 2011
Publication statusPublished - 2011


  • gratings
  • substrates
  • laser excitation
  • quantum dot lasers
  • pump lasers

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