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Linewidth enhancement factor of terahertz quantum cascade lasers (Articolo in rivista)

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Linewidth enhancement factor of terahertz quantum cascade lasers (Articolo in rivista) (literal)

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Green, RP; Xu, JH; Mahler, L; Tredicucci, A; Beltram, F; Giuliani, G; Beere, HE; Ritchie, DA (2008)
Linewidth enhancement factor of terahertz quantum cascade lasers
in Applied physics letters
(literal)

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Green, RP; Xu, JH; Mahler, L; Tredicucci, A; Beltram, F; Giuliani, G; Beere, HE; Ritchie, DA (literal)

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\"[Green, Richard P.; Xu, Ji-Hua; Mahler, Lukas; Tredicucci, Alessandro; Beltram, Fabio] INFM, CNR, NEST, I-56126 Pisa, Italy; [Green, Richard P.; Xu, Ji-Hua; Mahler, Lukas; Tredicucci, Alessandro; Beltram, Fabio] Scuola Normale Super Pisa, I-56126 Pisa, Italy; [Giuliani, Guido] Univ Pavia, Dipartimento Elettr, I-27100 Pavia, Italy; [Beere, Harvey E.; Ritchie, David A.] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England (literal)

Titolo

Abstract

The linewidth enhancement factor (LEF) of terahertz quantum cascade lasers is measured using an optical feedback self-mixing technique. As expected, a much lower LEF is found than is common for interband lasers, but instead of the predicted value of zero, the LEF depends on the laser conditions and can be as high as 0.5. The measured value tends to increase with increasing current. Cross absorption within the laser active region is suggested as a possible cause for the nonzero LEF observed. (C) 2008 American Institute of Physics. (literal)

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