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Title: High-power, low-lateral divergence broad area quantum cascade lasers with a tilted front facet

We introduce a simple technique to improve the beam quality of broad area quantum cascade lasers. Moderately tilted front facets of the laser provide suppression of higher order lateral waveguide modes. A device with a width of 60 μm and a front facet angle of 17° shows a nearly diffraction limited beam profile. In addition, the peak output power and the slope efficiency of the device are increased since most of the light inside the cavity is emitted through the tilted front facet by an asymmetric light intensity distribution along the cavity.
Authors:
; ; ; ; ; ; ;  [1]
  1. Institute for Solid State Electronics, Vienna University of Technology, 1040 Vienna (Austria)
Publication Date:
OSTI Identifier:
22283264
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 5; 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; 43 PARTICLE ACCELERATORS; ASYMMETRY; BEAM PROFILES; CAVITY RESONATORS; DIFFRACTION; EFFICIENCY; LASER RADIATION; PHOTON BEAMS; PHOTON EMISSION; SOLID STATE LASERS; VISIBLE RADIATION