Quantum cascade lasers with low-loss chalcogenide lateral waveguides

Claire Gmachl, Harold Y. Hwang, Roberto Paiella, Deborah L. Sivco, James N. Baillargeon, Federico Capasso, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Quantum cascade lasers have been fabricated with chalcogenide lateral waveguide claddings. Several-micrometer-thick Ge 0.25Se 0.75 glass has been deposited by pulsed laser ablation onto the sidewalls of narrow, deep etched laser ridges. Due to the intrinsically low mid-infrared attenuation of the chalcogenide material, the waveguide loss of the lasers is significantly reduced, by up to ∼50%, depending on the ridge width, when compared to conventional ridge waveguides. This resulted in an improved overall laser performance, such as a reduction of the threshold current density, an increase in slope efficiency, and an improved temperature performance.

Original languageEnglish (US)
Pages (from-to)182-184
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - Mar 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


  • Chalcogenide glass
  • Mid-infrared
  • Pulsed laser ablation
  • Unipolar semiconductor laser
  • Waveguides


Dive into the research topics of 'Quantum cascade lasers with low-loss chalcogenide lateral waveguides'. Together they form a unique fingerprint.

Cite this