Wavelength-tunable colloidal quantum dot laser on ultra-thin flexible glass

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Abstract

A mechanically flexible and wavelength-tunable laser with an ultra-thin glass membrane as substrate is demonstrated. The optically pumped hybrid device has a distributed feedback cavity that combines a colloidal quantum dot gain film with a grating-patterned polymeric underlayer, all on a 30-μm thick glass sheet. The total thickness of the structure is only 75 μm. The hybrid laser has an average threshold fluence of 450 ± 80 μJ/cm2 (for 5-ns excitation pulses) at an emitting wavelength of 607 nm. Mechanically bending the thin-glass substrate enables continuous tuning of the laser emission wavelength over an 18-nm range, from 600 nm to 618 nm. The correlation between the wavelength tunability and the mechanical properties of the thin laser structure is verified theoretically and experimentally.

Original languageEnglish
Article number141108
Number of pages4
JournalApplied Physics Letters
Volume104
Issue number14
DOIs
Publication statusPublished - 11 Apr 2014

Keywords

  • quantum dot laser
  • ultra thin flexible glass
  • wavelength tunability
  • laser glasses
  • diffraction gratings
  • distributed feedback lasers
  • emission spectra
  • laser materials

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