期刊
OPTICS EXPRESS
卷 17, 期 15, 页码 12929-12943出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.012929
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资金
- U. S. Army Research Laboratory
- U.S. Army Office [W911NF-04-1-0253]
In this study, we report the unequivocal demonstration of mid-infrared 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. (C) 2009 Optical Society of America
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