Phase-locking to a free-space terahertz comb for metrological-grade terahertz lasers

  title={Phase-locking to a free-space terahertz comb for metrological-grade terahertz lasers},
  author={Luigi Consolino and Andrea Taschin and Paolo Bartolini and Saverio Bartalini and Pablo Cancio and Alessandro Tredicucci and Harvey E. Beere and David A. Ritchie and Renato Torre and Miriam Serena Vitiello and Paolo De Natale},
  journal={Nature Communications},
Optical frequency comb synthesizers have represented a revolutionary approach to frequency metrology, providing a grid of frequency references for any laser emitting within their spectral coverage. Extending the metrological features of optical frequency comb synthesizers to the terahertz domain would be a major breakthrough, due to the widespread range of accessible strategic applications and the availability of stable, high-power and widely tunable sources such as quantum cascade lasers. Here… 

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