Stability of Pulse Emission and Enhancement of Intracavity Second-Harmonic Generation in Self-Mode-Locked Quantum Cascade Lasers

Alexander Soibel, Federico Capasso, Claire Gmachl, Milton L. Peabody, A. Michael Sergent, Roberto Paiella, Deborah L. Sivco, Alfred Y. Cho, H. C. Liu

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We report the observation of stable pulse emission and enhancement of intracavity second-harmonic generation (SHG) in self-mode-locked quantum cascade (QC) lasers. Down-conversion of the detector signal by heterodyning with an RF signal allows the direct observation of the pulsed laser emission in the time domain and reveals a stable train of pulses characteristic of mode-locked lasers. The onset of self-mode locking in QC lasers with built-in optical nonlinearity results in a significant increase of the SHG signal. A pulse duration of ∼12 ps is estimated from the measured increase of the SHG signal in pulsed emission compared to the power expected for the SHG signal in CW emission. This value is in good agreement with the pulse duration deduced from the optical spectral width.

Original languageEnglish (US)
Pages (from-to)197-204
Number of pages8
JournalIEEE Journal of Quantum Electronics
Volume40
Issue number3
DOIs
StatePublished - Mar 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Keywords

  • Mode-locked lasers
  • Nonlinear optics
  • Pulse generation
  • Pulsed laser
  • Semiconductor lasers
  • Ultrafast optics

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