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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8297–8302

Temperature-insensitive long-wavelength (λ ≈14 µm) Quantum Cascade lasers with low threshold

Xue Huang, William O. Charles, and Claire Gmachl  »View Author Affiliations

Optics Express, Vol. 19, Issue 9, pp. 8297-8302 (2011)

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We demonstrate high-performance, long-wavelength (λ ≈14 µm) Quantum Cascade (QC) lasers based on a diagonal optical transition and a “two-phonon-continuum” depletion scheme in which the lower laser level is depopulated by resonant longitudinal optical phonon scattering followed by scattering to a lower energy level continuum. A 2.8 mm long QC laser shows a low threshold current density of 2.0 kA/cm2, a peak output power of ~336 mW, and a slope efficiency of 375 mW/A, all at 300K, with a high characteristic temperature T0 ~310 K over a wide temperature range from 240 K to 390 K.

© 2011 OSA

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(230.5590) Optical devices : Quantum-well, -wire and -dot devices

ToC Category:
Lasers and Laser Optics

Original Manuscript: March 16, 2011
Manuscript Accepted: April 3, 2011
Published: April 14, 2011

Xue Huang, William O. Charles, and Claire Gmachl, "Temperature-insensitive long-wavelength (λ ≈14 µm) Quantum Cascade lasers with low threshold," Opt. Express 19, 8297-8302 (2011)

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