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Fundamental mode operation in broad area quantum cascade lasers

  • US 10,084,282 B1
  • Filed: 08/14/2017
  • Issued: 09/25/2018
  • Est. Priority Date: 08/14/2017
  • Status: Active Grant
First Claim
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1. A broad area quantum cascade laser for emitting infrared light, comprising:

  • an optical cavity comprised of an active region situated between a top cladding and a bottom cladding;

    the cavity being fabricated from structure grown by gas source molecular beam epitaxy on an n−

    InP(001) substrate;

    the active region being fabricated in a plurality of stages, with multilayer GaInAs/AlInAs injector regions in each of the stages;

    the top and bottom claddings having a cladding refractive index;

    a concave excavation extending into the bottom cladding and having a refractive index less than the cladding refractive index; and

    the excavation having a size and shape to suppress high order transverse modes of light in the cavity and favor a fundamental transverse mode, wherebythe laser generates a single-lobed light beam collinear with an optical axis.

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