Quantum cascade lasers are bright and compact semiconductor lasers that emit light in the mid- to far-infrared spectral region. The use of a closed ring cavity has now set them on the path towards ultrafast pulses.
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Riemensberger, J. Ring a ring o’ pulses. Nat. Phys. 16, 708–709 (2020). https://doi.org/10.1038/s41567-020-0945-2