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

A comprehensive investigation of the frequency-noise spectral density of a free-running mid-infrared 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 Hz. 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 formula and predicts a narrowing beyond the limit set by the radiative lifetime of the upper level.

preprint2010arXivOpen access
S. BartaliniS. BorriP. CancioA. CastrilloI. GalliG. GiusfrediD. MazzottiL. GianfraniP. De Natale
physics.atom-phphysics.optics
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Open access9 authors2 topics
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S. BartaliniS. BorriP. CancioA. CastrilloI. GalliG. GiusfrediD. MazzottiL. GianfraniP. De Natale

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