Passive mode-locking in semiconductor lasers with saturable absorbers bandgap shifted through quantum well intermixing

Vincenzo Pusino, Michael J. Strain, Marc Sorel

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Passive mode-locking in semiconductor lasers in a Fabry-Perot configuration with a bandgap blueshift applied to the saturable absorber (SA) section has been experimentally characterized. For the first time a fully post-growth technique, quantum well intermixing, was adopted to modify the material bandgap in the SA section. The measurements showed not only an expected narrowing of the pulse width but also a significant expansion of the range of bias conditions generating a stable train of optical pulses. Moreover, the pulses from lasers with bandgap shifted absorbers presented reduced chirp and increased peak power with respect to the nonshifted case.

Original languageEnglish
Pages (from-to)186-189
Number of pages4
JournalPhotonics Research
Issue number6
Publication statusPublished - 1 Dec 2014



  • integrated optics devices
  • mode-locked lasers
  • semiconductor lasers

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