Observing the intrinsic linewidth of a quantum-cascade laser: beyond the Schawlow-Townes limit.
Phys Rev Lett
; 104(8): 083904, 2010 Feb 26.
Article
em En
| MEDLINE
| ID: mdl-20366933
ABSTRACT
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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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article