Scientific Results

Frequency-noise dynamics of mid-infrared quantum cascade lasers

Year: 2011

Authors: Borri S., Bartalini S., Cancio P., Galli I., Giusfredi G., Mazzotti D., Yamanishi M., De Natale P.

Autors Affiliation: Istituto Nazionale di Ottica-Consiglio Nazionale Delle Ricerche, Florence 50125, Italy; European Laboratory for Nonlinear Spectroscopy, Sesto Fiorentino 50019, Italy; Central Research, Laboratories Hamamatsu Photonics KK, Hamamatsu 434-8601, Japan

Abstract: By measuring the frequency-noise power spectral density of a cryogenically-cooled mid-infrared quantum cascade laser, we investigate the different contributions to the noise spectrum and identify the main differences with respect to standard bipolar semiconductor devices. In particular, the existence of a thermal cut-off on the 1/f noise allows to identify the current fluctuations through the heterostructure as the physical mechanism, intrinsic to the device, at the basis of the measured flicker noise. This result, marking the difference with bipolar semiconductor devices, is confirmed analyzing the laser frequency response to a modulation of the driving current.


Volume: 47 (7)      Pages from: 984  to: 988

More Information: This work was supported in part by the Ente Cassa di Risparmio di Firenze, by Ministero dell’Istruzione, dell’Università e della Ricerca under the Programmi di ricerca di Rilevante Interesse Nazionale (PRIN) – 2008 “Spettroscopia diretta multispettrale con pettini di frequenza amplificati tra 2 e 3 microm” and by Regione Toscana under the projects Capacità Tecnologica e Operativa della Toscana per l’Utilizzo dello Spazio (CTOTUS) and Sistemi Innovativi di Misura per la Protezione dell’Ambiente e della Salute (SIMPAS), in the framework of Programma Operativo Regionale-Competitività Regionale e Occupazione Fondo Europeo per lo Sviluppo Regionale 2007–2013.
KeyWords: 1/F noise; A-thermal; Current fluctuations; Cut-off; Driving current; Flicker noise; Frequency dynamics; frequency noise; Laser frequency; Mid-infrared quantum cascade; Noise spectra; Physical mechanism; Quantum cascades, Bipolar semiconductor devices; Dynamics; Frequency response; Infrared devices; Power spectral density; Quantum cascade lasers; Semiconductor lasers; Semiconductor switches; Spectral density, Infrared lasers
DOI: 10.1109/JQE.2011.2147760

Citations: 29
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