Retrieval of phase relation and emission profile of quantum cascade laser frequency combs

@article{Cappelli2019RetrievalOP,
  title={Retrieval of phase relation and emission profile of quantum cascade laser frequency combs},
  author={Francesco Cappelli and Luigi Consolino and G. Campo and Iacopo Galli and Davide Mazzotti and Annamaria Campa and Mario Siciliani de Cumis and Pablo Cancio Pastor and Roberto Eramo and Markus R{\"o}sch and Mattias Beck and Giacomo Scalari and J{\'e}r{\^o}me Faist and Paolo De Natale and Saverio Bartalini},
  journal={Nature Photonics},
  year={2019},
  pages={1-7}
}
Recently, the field of optical frequency combs experienced a major development of new sources. They are generally much smaller in size (on the scale of millimetres) and can extend frequency comb emission to other spectral regions, in particular towards the mid- and far-infrared regions. Unlike classical pulsed frequency combs, their mode-locking mechanism relies on four-wave-mixing nonlinear processes, yielding a non-trivial phase relation among the modes and an uncommon emission time profile… 

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