In situ probing of mode-locked vertical-external-cavity-surface-emitting lasers

Caleb Baker, Maik Scheller, Stephan W. Koch, Antje R. Perez, Wolfgang Stolz, R. Jason Jones, Jerome V. Moloney

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We utilize an asynchronous optical sampling technique to study the gain dynamics of vertical-external-cavity-surface-emitting lasers (VECSELs) under mode-locked operation. This allows for an in situ characterization of the gain depletion and recovery over nanoseconds with femtosecond-scale resolution. Our method allows for a more direct study of intracavity gain dynamics than traditional pump/probe measurements. We observe a rapid depletion of the gain on the timescale of the intracavity pulse. Afterward, a rapid recovery over a few picoseconds due to intraband scattering and carrier heating takes place, followed by a long recovery attributed to the continuous supply of carriers by the pump laser.

Original languageEnglish (US)
Pages (from-to)5459-5462
Number of pages4
JournalOptics letters
Issue number23
StatePublished - Dec 1 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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