Mode-locked pulses from mid-infrared Quantum Cascade Lasers

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DOIResolve DOI: http://doi.org/10.1364/OE.17.012929
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TypeArticle
Journal titleOptics Express
Volume17
Issue15
Pages1992912943; # of pages: 6987
AbstractIn this study, we report the unequivocal demonstration of midinfrared mode-locked pulses from quantum cascade lasers. The train of short pulses was generated by actively modulating the current and hence the gain of an edge-emitting quantum cascade laser (QCL). Pulses with duration of about 3 ps at full-width-at-half-maxima and energy of 0.5 pJ were characterized using a second-order interferometric autocorrelation technique based on a nonlinear quantum well infrared photodetector. The modelocking dynamics in the QCLs was modeled based on the Maxwell-Bloch equations in an open two-level system. Our model reproduces the overall shape of the measured autocorrelation traces and predicts that the short pulses are accompanied by substantial wings as a result of strong spatial hole burning. The range of parameters where short mode-locked pulses can be formed is found.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedNo
NPARC number18067924
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Record identifier4e7f1187-f8be-43a9-a793-3d9a1bfd865c
Record created2011-06-14
Record modified2016-05-09
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