Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 47, Issue 7, Pages 984-988Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2011.2147760
Keywords
Frequency dynamics; frequency noise; physics of semiconductors; quantum cascade lasers
Categories
Funding
- Ente Cassa di Risparmio di Firenze
- Ministero dell'Istruzione, dell'Universita e della Ricerca
- Regione Toscana
- Sistemi Innovativi di Misura per la Protezione dell'Ambiente e della Salute (SIMPAS)
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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.
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