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Wavelength tuning and thermal dynamics of continuous-wave mid-IR distributed feedback quantum cascade laser

Lionel Tombez, Francesco Cappelli, Stephane Schilt, Gianni Di Domenico, Saverio Bartalini & Daniel Hofstetter

Abstract We report on the wavelength tuning dynamics in continuous-wave distributed feedback quantum cascade lasers (QCLs). The wavelength tuning response for direct current modulation of two mid-IR QCLs from different suppliers was measured from 10 Hz up to several MHz using ro-vibrational molecular resonances as frequency-to-intensity converters. Unlike the output intensity, which can be modulated up to several gigahertz, the frequency-modulation bandwidth was found to be on the order of 200 kHz, limited by the laser thermal dynamics. A non-negligible roll-off and a significant phase shift are observed above a few hundred hertz already and explained by a thermal model.
   
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Citation Tombez, L., Cappelli, F., Schilt, S., Di Domenico, G., Bartalini, S., & Hofstetter, D. (2013). Wavelength tuning and thermal dynamics of continuous-wave mid-IR distributed feedback quantum cascade laser. Appl. Phys. Lett., 103(031111), 1-5.
   
Type Journal article (English)
Date of appearance 17-7-2013
Journal Appl. Phys. Lett.
Volume 103
Issue 031111
Pages 1-5
URL http://scitation.aip.org/content/aip/journal/apl/103/3/10...
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