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  • Ha Ryu, Jae, et al. (author)
  • Beam stability of buried-heterostructure quantum cascade lasers employing HVPE regrowth
  • 2021
  • In: Optics Express. - : The Optical Society. - 1094-4087. ; 29:2, s. 2819-2826
  • Journal article (peer-reviewed)abstract
    • Measurements of beam stability for mid-infrared (IR)-emitting quantum cascade lasers (QCLs) are important for applications that require the beam to travel through air to remote targets, such as free-space communication links. We report beam-quality measurement results of narrow-ridge, 4.6 mu m-emitting buried-heterostructure (BH) QCLs fabricated using ICP etching and HVPE regrowth. Beam-quality measurements under QCW operation exhibit M-2 < 1.2 up to 1 W for similar to 5 mu m-wide ridges. 5 mu m-wide devices display some small degree of centroid motion with increasing output power (< 0.125 mrad), which corresponds to a targeting error of similar to 1.25 cm over a distance of 100 m.
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