Mode-Locked Pulses from Mid-Infrared Quantum Cascade Lasers

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Mode-Locked Pulses from Mid-Infrared Quantum Cascade Lasers

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Title: Mode-Locked Pulses from Mid-Infrared Quantum Cascade Lasers
Author: Wang, Christine Y.; Kuznetsova, Lyuba; Gkotsas, Vasileios‐Marios; Diehl, Laurent; Kaertner, Franz X.; Belkin, Mikhail A.; Belyanin, Alexey; Li, Xiaofeng; Ham, Donhee; Schneider, Harald; Grant, Peter; Song, C. Y.; Haffouz, Soufien; Wasilewski, Zbigniew; Liu, H. C.; Capasso, Federico

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Citation: Wang, Christine Y., Lyuba Kuznetsova, Gkotsas Vasileios‐Marios, Laurent Diehl, Franz X. Kaertner, Mikhail A. Belkin, Alexey Belyanin, Xiaofeng Li, Donhee Ham, Harald Schneider, Peter Grant, et al. 2009. Mode-locked pulses from mid-infrared quantum cascade lasers. Optics Express 17(15): 12929-12943.
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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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