Low voltage-defect quantum cascade laser with heterogeneous injector regions

Low voltage-defect quantum cascade laser with heterogeneous injector regions

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...

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Bibliographic Details
Published in:Optics express Vol. 15; no. 24; pp. 15818 - 15823
Main Authors: Hoffman, Anthony J, Schartner, Stephan, Howard, Scott S, Franz, Kale J, Towner, Fred, Gmachl, Claire
Format: Journal Article
Language:English
Published: United States 26-11-2007
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Summary: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%.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.15.015818