Open AccessLow voltage-defect quantum cascade laser with heterogeneous injector regions
Author(s) -
Anthony J. Hoffman,
S. Schartner,
Scott S. Howard,
Kale J. Franz,
Fred Towner,
Claire F. Gmachl
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.015818
Subject(s) - materials science , injector , cascade , optics , quantum cascade laser , laser , optoelectronics , voltage , wavelength , quantum efficiency , physics , chemistry , chromatography , quantum mechanics , thermodynamics
We demonstrate an In(0.635)Al(0.356)As/In(0.678)Ga(0.322)As strain compensated quantum cascade laser that employs heterogeneous injector regions for low voltage defect operation. The active core consists of interdigitated undoped and doped injectors followed by nominally identical wavelength optical transitions. The undoped injector regions are designed with reduced voltage defect while the doped injectors are of a more conventional design. The measured average voltage defect is less than 79 meV. At 80 K, a 2.3 mm long, back facet high reflectance coated laser has an emission wavelength of 4.7 mum and outputs 2.3 W pulsed power with a peak wall-plug efficiency of 19%.