Submonolayer Quantum-Dot Based Saturable Absorber for Femtosecond Pulse Generation

S. J. Addamane, A. Laurain, C. W. Baker, T. J. Rotter, J. Watt, J. L. Reno, G. Balakrishnan, J. V. Moloney

Research output: Contribution to journalArticlepeer-review


Semiconductor saturable absorber mirrors (SESAMs) enable passive modelocking of several ultrafast solid-state lasers. Conventionally, SESAMs in the 1-µm wavelength range have employed InGaAs quantum wells (QWs) as absorbers. We demonstrate here a SESAM based on InAs/GaAs submonolayer quantum dots (SML QDs) capable of generating femtosecond pulses by passively modelocking a vertical-external-cavity surface-emitting laser (VECSEL). Structural measurements are carried out to verify the quality and composition of the QDs. Modelocking experiments with a VECSEL and the QD SESAM in a ring cavity configuration yield pulses as short as 185 fs at 1025 nm. Compared to a traditional QW absorber, SML QD SESAMs exhibit ~ 25% faster recovery times. This also translates to slower power degradation rates or higher damage thresholds in SML QD SESAMs.

Original languageEnglish (US)
Pages (from-to)2710-2715
Number of pages6
JournalJournal of Electronic Materials
Issue number5
StatePublished - May 2021


  • Femtosecond pulse
  • modelocked laser
  • saturable absorber
  • submonolayer quantum dot
  • ultrafast laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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