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Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature
Résumé We report on the measurement of the frequency noise power spectral density in a distributed feedback quantum cascade laser over a wide temperature range, from 128 K to 303 K. As a function of the device temperature, we show that the frequency noise behavior is characterized by two different regimes separated by a steep transition at ≈200 K. While the frequency noise is nearly unchanged above 200 K, it drastically increases at lower temperature with an exponential dependence. We also show that this increase is entirely induced by current noise intrinsic to the device. In contrast to earlier publications, a single laser is used here in a wide temperature range allowing the direct assessment of the temperature dependence of the frequency noise.
   
Mots-clés Fluctuations, relaxations, and noise; Linewidth; Semiconductor lasers, quantum cascade
   
Citation Tombez, L., Schilt, S., Di Francesco, J., Thomann, P., & Hofstetter, D. (2012). Temperature dependence of the frequency noise in a mid-IR DFB quantum cascade laser from cryogenic to room temperature. Optics Express, 20(7), 6851-6859.
   
Type Article de périodique (Anglais)
Date de publication 12-3-2012
Nom du périodique Optics Express
Volume 20
Numéro 7
Pages 6851-6859
URL http://www.opticsinfobase.org/oe/fulltext.cfm?uri=oe-20-7...
Liée au projet Fundamental metrology with laser-cooled atoms and optical...