Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit.

  title={Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit.},
  author={Saverio Bartalini and Simone Borri and Pablo Cancio and Antonio Castrillo and Iacopo Galli and Giovanni Giusfredi and Davide Mazzotti and Livio Gianfrani and Paolo De Natale},
  journal={Physical review letters},
  volume={104 8},
A comprehensive investigation of the frequency-noise spectral density of a free-running midinfrared quantum-cascade laser is presented for the first time. It provides direct evidence of the leveling of this noise down to a white-noise plateau, corresponding to an intrinsic linewidth of a few hundred hertz. The experiment is in agreement with the most recent theory on the fundamental mechanism of line broadening in quantum-cascade lasers, which provides a new insight into the Schawlow-Townes… CONTINUE READING
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