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

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

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

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
Volume40
Issue number23
DOIs
StatePublished - Dec 1 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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