Colloidal quantum dot random laser

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

We report random laser action in a system where optical amplification is provided by colloidal quantum dots (CQDs). This system is obtained by depositing from solution CdSe/ZnS core-shell CQDs into rough micron-scale grooves fabricated on the surface of a glass substrate. The combination of CQD random packing and of disordered structures in the glass groove enables gain and multiple scattering. Upon optical excitation, random laser action is triggered in the system above a 25-mJ/cm2 threshold. Single-shot spectra were recorded to study the emission spectral characteristics and the results show the stability of the laser mode positions and the dominance of the modes close to the material gain maximum.
Original languageEnglish
Pages (from-to)2996-3003
Number of pages8
JournalOptics Express
Volume19
Issue number4
DOIs
Publication statusPublished - 1 Feb 2011

Keywords

  • laser materials
  • multiple scattering
  • random laser action
  • optical amplification

Cite this