Ring-cavity surface-emitting lasers as a building block for tunable and coherent quantum cascade laser arrays

E. Mujagić, C. Schwarzer, W. Schrenk, J. Chen, Claire F. Gmachl, G. Strasser

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

We describe ring-cavity surface-emitting lasers (ring-CSELs) based on quantum cascade structures as an elementary building block for two-dimensional quantum cascade laser arrays. The light emitters operate at high temperatures as high as 380 K and above. The devices facilitate a reduction in threshold current density as well as enhanced radiation efficiency in comparison to Fabry-Pérot lasers. Single-mode emission is observed at a wavelength of around 8 μm with a side-mode suppression ratio of 30 dB at room temperature. A tuning of the resonance is achieved by a variation in the grating period or a change in temperature. Phase locking of two ring-CSELs is demonstrated which is based on a direct coupling scheme. Coherent operation of ring-type lasers results in light emission at an identical wavelength and thus in an enhancement of the spectral brightness.

Original languageEnglish (US)
Article number014019
JournalSemiconductor Science and Technology
Volume26
Issue number1
DOIs
StatePublished - Jan 1 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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