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Title: Surface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range

We demonstrate efficient surface-emitting terahertz frequency quantum cascade lasers with continuous wave output powers of 20–25 mW at 15 K and maximum operating temperatures of 80–85 K. The devices employ a resonant-phonon depopulation active region design with injector, and surface emission is realized using resonators based on graded photonic heterostructures (GPHs). GPHs can be regarded as energy wells for photons and have recently been implemented through grading the period of the photonic structure. In this paper, we show that it is possible to keep the period constant and grade instead the lateral metal coverage across the GPH. This strategy ensures spectrally single-mode operation across the whole laser dynamic range and represents an additional degree of freedom in the design of confining potentials for photons.
Authors:
 [1] ;  [2] ; ; ;  [3] ; ; ;  [1]
  1. Institut d'Electronique Fondamentale, Univ. Paris Sud, UMR8622 CNRS, 91405 Orsay (France)
  2. (China)
  3. School of Electronic and Electrical Engineering, University of Leeds, Leeds LS9 2JT (United Kingdom)
Publication Date:
OSTI Identifier:
22283060
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 9; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CAVITY RESONATORS; DEGREES OF FREEDOM; HETEROJUNCTIONS; METALS; NANOSTRUCTURES; PHONONS; PHOTON EMISSION; PHOTONS; POTENTIALS; SOLID STATE LASERS; SURFACES