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Picosecond pulses from a mid-infrared interband cascade laser

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arxiv 1907.00346 v1 pith:XDM6QYHC submitted 2019-06-30 physics.app-ph physics.optics

classification physics.app-phphysics.optics
keywords pulsesmodulationfrequencygenerationcascadechirpinterbandmid-infrared
verification ladder T0 review T1 audit T2 compute T3 formal
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The generation of mid-infrared pulses in monolithic and electrically pumped devices is of great interest for mobile spectroscopic instruments. The gain dynamics of interband cascade lasers (ICL) are promising for mode-locked operation at low threshold currents. Here, we present conclusive evidence for the generation of picosecond pulses in ICLs via active mode-locking. At small modulation power, the ICL operates in a linearly chirped frequency comb regime characterized by strong frequency modulation. Upon increasing the modulation amplitude, the chirp decreases until broad pulses are formed. Careful tuning of the modulation frequency minimizes the remaining chirp and leads to the generation of 3.2 ps pulses.

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