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The generation of stable trains of ultra-short (fs-ps), terahertz(THz)-frequency radiation pulses, with large instantaneous intensities, is anunderpinning requirement for the investigation of light-matter interactions,for metrology and for ultra-high-speed communications. In solid-stateelectrically-pumped lasers, the primary route for generating short pulses isthrough passive mode-locking. However, this has not yet been achieved in theTHz range, defining one of the longest standing goals over the last twodecades. In fact, the realization of passive mode-locking has long been assumedto be inherently hindered by the fast recovery times associated with theintersubband gain of THz lasers. Here, we demonstrate a self-startingminiaturized ultra-short pulse THz laser, exploiting an original devicearchitecture that includes the surface patterning of multilayer-graphenesaturable absorbers distributed along the entire cavity of a double-metalsemiconductor 2.30-3.55 THz wire laser. Self-starting pulsed emission with4.0-ps-long pulses in a compact, all-electronic, all-passive and inexpensiveconfiguration is demonstrated.

Ultrashort pulse generation from a graphene-coupled passively mode-locked terahertz laser