Mid-infrared quantum cascade laser frequency combs with a microstrip-like line waveguide geometry

  title={Mid-infrared quantum cascade laser frequency combs with a microstrip-like line waveguide geometry},
  author={Filippos Kapsalidis and Barbara Schneider and Matthew Singleton and Mathieu Bertrand and Emilio Gini and Mattias Beck and J{\'e}r{\^o}me Faist},
  journal={Applied Physics Letters},
In this work, a design for a mid-infrared quantum cascade laser frequency comb source that enhances the high frequency response and the comb characteristics of the device is presented. A state-of-the-art active region, grown on a heavily n-doped InP:Si substrate, was processed into a buried heterostructure with a microstrip-like line waveguide. As a result, the repetition rate frequency frep, around 11.09 GHz, can be locked to an injected narrow-linewidth radio frequency (RF) signal, over a… 

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