Mode-locked pulses from mid-infrared quantum cascade lasers.
C. Y. Wang,Lyuba Kuznetsova,Vasileios-Marios Gkortsas,Laurent Diehl,Franz X. Kärtner,Mikhail A. Belkin,Alexey Belyanin,Xiaofeng Li,Donhee Ham,Harald Schneider,P. D. Grant,C. Y. Song,Soufien Haffouz,Z. R. Wasilewski,H. C. Liu,Federico Capasso +15 more
TL;DR: This study reports the unequivocal demonstration of midinfrared mode-locked pulses from quantum cascade lasers generated by actively modulating the current and hence the gain of an edge-emitting quantum cascade laser (QCL).
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Abstract: In 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 mode-locking 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.
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Citations
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