期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.083904
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资金
- Ente Cassa di Risparmio di Firenze
- Centro Regionale di Competenza INNOVA
- CNR
- European Science Foundation EUROCORES Program EUROQUAM-CIGMA
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 formula and predicts a narrowing beyond the limit set by the radiative lifetime of the upper level.
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