Measuring frequency noise and intrinsic linewidth of a room-temperature DFB quantum cascade laser

Year: 2011

Authors: Bartalini S., Borri S., Galli I., Giusfredi G., Mazzotti D., Edamura T., Akikusa N., Yamanishi M., De Natale P.

Autors Affiliation: CNR, Ist Nazl Ott INO, I-50125 Firenze Fi, Italy; European Lab Nonlinear Spect LENS, I-50019 Sesto Fiorentino Fi, Italy; Hamamatsu Photon KK, Cent Res Labs, Shizuoka 4348601, Japan

Abstract: The frequency-noise power spectral density of a roomtemperature distributed-feedback quantum cascade laser emitting at lambda = 4.36 mu m m has been measured. An intrinsic linewidth value of 260 Hz is retrieved, in reasonable agreement with theoretical calculations. A noise reduction of about a factor 200 in most of the frequency interval is also found, with respect to a cryogenic laser at the same wavelength. A quantitative treatment shows that it can be explained by a temperature-dependent mechanism governing the transport processes in resonant tunnelling devices. This confirms the predominant effect of the heterostructure in determining shape and magnitude of the frequency noise spectrum in QCLs. (C) 2011 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 19 (19)      Pages from: 17996  to: 18003

More Information: We gratefully acknowledge Dr. Pablo Cancio Pastor for his critical reading of the manuscript and M. Giuntini, A. Montori and M. De Pas from LENS for their help on driving electronics. This work was partially supported by Ente Cassa di Risparmio di Firenze and by Regione Toscana through the projects CTOTUS and SIMPAS, in the framework of POR-CReO FESR 2007-2013.
KeyWords: Linewidth; MY-M; Operation; Shape; Power spectral density; Spectral density, Cryogenic laser; Distributed-feedback; Frequency intervals; Frequency noise spectra; Measuring frequency; Quantitative treatment; Quantum cascades; Resonant tunnelling devices; Room temperature; Temperature dependent; Theoretical calculations; Transport process, Quantum cascade lasers
DOI: 10.1364/OE.19.017996

Citations: 82
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