Quantum dot vertical-cavity surface-emitting lasers covering the 'green gap'

Yang Mei, Guo En Weng, Bao Ping Zhang*, Jian Ping Liu, Werner Hofmann, Lei Ying Ying, Jiang Yong Zhang, Zeng Cheng Li, Hui Yang, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


Semiconductor vertical-cavity surface-emitting lasers (VCSELs) with wavelengths from 491.8 to 565.7 nm, covering most of the 'green gap', are demonstrated. For these lasers, the same quantum dot (QD) active region was used, whereas the wavelength was controlled by adjusting the cavity length, which is difficult for edge-emitting lasers. Compared with reports in the literature for green VCSELs, our lasers have set a few world records for the lowest threshold, longest wavelength and continuous-wave (CW) lasing at room temperature. The nanoscale QDs contribute dominantly to the low threshold. The emitting wavelength depends on the electron-photon interaction or the coupling between the active layer and the optical field, which is modulated by the cavity length. The green VCSELs exhibit a low-thermal resistance of 915kW-1 which benefits the CW lasing. Such VCSELs are important for small-size, low power consumption full-color displays and projectors.

Original languageEnglish
Article numbere16199
JournalLight: Science and Applications
Issue number1
StatePublished - 1 Jan 2017


  • GaN
  • InGaN
  • Quantum dot
  • Vertical-cavity surface-emitting laser
  • Wide-gap semiconductor

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