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arxiv 2405.10203 v1 pith:ECGV2CUV submitted 2024-05-16 physics.optics

Fast Gain Dynamics in Interband Cascade Lasers

Florian Pilat , Andreas Windischhofer , Maximilian Beiser , Vito F. Pecile , Elizaveta Gangrskaia , Audrius Pug\v{z}lys , Robert Weih , Johannes Koeth
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Andrius Baltu\v{s}ka Oliver H. Heckl Benedikt Schwarz
This is my paper
classification physics.optics
keywords dynamicsfastpassivecascadegaininterbandlasersmode-locking
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Interband Cascade Lasers (ICL) have matured into a versatile technological platform in the mid-infrared spectral domain. To broaden their applicability even further, ongoing research pursues the emission of ultrashort pulses. The most promising approach is passive mode-locking with a fast saturable absorber. However, despite vast attempts no passive mode-locked ICL has been demonstrated up to date. In this study we perform pump-probe measurements on the ICL gain and show that its dynamics are mainly ($\sim$70%) governed by a fast recovery time of 2 ps. Our findings explain why passive mode-locking has not succeeded so far, shedding a new light on ICL dynamics as we propose strategies to overcome the current limitations.

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