Stable mode-locked pulses from mid-infrared semiconductor lasers

Details Stable mode-locked pulses from mid-infrared semiconductor lasers Stable mode-locked pulses from mid-infrared semiconductor lasers

2009-03-25

arxiv.org/abs/0903.4385v1

Optics Express, Vol. 17, Issue 15, pp. 12929-12943 (2009)

Physics

Optics

26 pages, 4 figures

Scientific paper

10.1364/OE.17.012929

We report the unequivocal demonstration of mid-infrared mode-locked pulses from a semiconductor laser. The train of short pulses was generated by actively modulating the current and hence the optical gain in a small section of an edge-emitting quantum cascade laser (QCL). Pulses with pulse duration at full-width-at-half-maximum of about 3 ps 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 modelled and simulated based on Maxwell-Bloch equations in an open two-level system. We anticipate our results to be a significant step toward a compact, electrically-pumped source generating ultrashort light pulses in the mid-infrared and terahertz spectral ranges.

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