Far-infrared surface-plasmon quantum-cascade lasers at 21.5 μm and 24 μm wavelengths

Raffaele Colombelli, Federico Capasso, Claire Gmachl, Albert L. Hutchinson, Deborah L. Sivco, Alessandro Tredicucci, Michael C. Wanke, A. Michael Sergent, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

210 Scopus citations


Quantum-cascade lasers operating above 20 μm (at λ∼21.5 μm and λ∼24 μm) wavelength are reported. Pulsed operation was obtained up to 140 K and with a peak power of a few milliwatts at cryogenic temperatures. Laser action originates from interminiband transitions in "chirped" superlattice active regions. The waveguides are based on surface-plasmon modes confined at a metal-semiconductor interface. The wavelengths were chosen in order to avoid major phonon absorption bands, which are particularly strong at energies just above the reststrahlen band. We also report on a 21.5-μm-wavelength laser based on a two-sided interface-plasmon waveguide.

Original languageEnglish (US)
Pages (from-to)2620-2622
Number of pages3
JournalApplied Physics Letters
Issue number18
StatePublished - Apr 30 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Far-infrared surface-plasmon quantum-cascade lasers at 21.5 μm and 24 μm wavelengths'. Together they form a unique fingerprint.

Cite this