Open AccessContinuous wave operation of buried heterostructure 46µm quantum cascade laser Y-junctions and tree arrays
Author(s) -
Arkadiy Lyakh,
Richard Maulini,
Alexei Tsekoun,
Rowel Go,
C. K. N. Patel
Publication year - 2014
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.22.001203
Subject(s) - materials science , heterojunction , quantum cascade laser , laser , cascade , optoelectronics , optics , continuous wave , epitaxy , metalorganic vapour phase epitaxy , etching (microfabrication) , radius , common emitter , physics , nanotechnology , chemistry , terahertz radiation , computer security , computer science , chromatography , layer (electronics)
Room-temperature continuous-wave operation for buried heterostructure 4.6 µm quantum cascade laser Y-junctions and tree arrays, overgrown using hydride vapor phase epitaxy, has been demonstrated. Pulsed wall plug efficiency for the Y-junctions with bending radius of 5mm was measured to be very similar to that of single-emitter lasers from the same material, indicating low coupling losses. Comparison between model and experimental data showed that the in-phase mode was dominating for 10mm-long Y-junctions with 5 µm-wide 1mm-long stem and 5 µm-wide branches. Total optical power over 1.5 W was demonstrated for four-branch QCL tree array.