High power sub-200fs pulse generation from a colliding pulse modelocked VECSEL

Alexandre Laurain, Declan Marah, Robert Rockmore, John G. McInerney, Jorg Hader, Antje Ruiz Perez, Stephan W. Koch, Wolfgang Stolz, Jerome V. Moloney

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


We present a passive and robust mode-locking scheme for a Vertical External Cavity Surface Emitting Laser (VECSEL).We placed the semiconductor gain medium and the semiconductor saturable absorber mirror (SESAM) strategically in a ring cavity to provide a stable colliding pulse operation. With this cavity geometry, the two counter propagating pulses synchronize on the SESAM to saturate the absorber together. This minimizes the energy lost and creates a transient carrier grating due to the interference of the two beams. The interaction of the two counter-propagating pulses in the SESAM is shown to extend the range of the modelocking regime and to enable higher output power when compared to the conventional VECSEL cavity geometry. In this configuration, we demonstrate a pulse duration of 195fs with an average power of 225mW per output beam at a repetition rate of 2.2GHz, giving a peak power of 460W per beam. The remarkable robustness of the modelocking regime is discussed and a rigorous pulse characterization is presented.

Original languageEnglish (US)
Title of host publicationVertical External Cavity Surface Emitting Lasers (VECSELs) VII
EditorsMichael Jetter
ISBN (Electronic)9781510606159
StatePublished - 2017
EventVertical External Cavity Surface Emitting Lasers (VECSELs) VII 2017 - San Francisco, United States
Duration: Jan 30 2017Jan 31 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherVertical External Cavity Surface Emitting Lasers (VECSELs) VII 2017
Country/TerritoryUnited States
CitySan Francisco


  • Colliding pulses
  • Modelocking
  • OPSL
  • Semiconductor
  • Ultra-short pulses

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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