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

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

2009-12-14

arxiv.org/abs/0912.2683v2

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.104.083904

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.

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