The possibility of using light bullets (LBs), i.e. pulses simultaneously confined in the transverse and the propagation directions, has attracted a lot of interest in the last twenty years, both for fundamental and practical reasons. In this work, we review the recent theoretical, numerical, and experimental advances regarding the realization of LBs in semiconductor passively mode-locked lasers. It was recently shown  that phase invariant Temporal Localized Structures (LSs) can evolve from passive mode-locking (PML). The PML regime leads to the emission of temporal pulses much shorter than the cavity round-trip and it is achieved by combining two elements, a laser amplifier providing a gain and a nonlinear loss element, usually a saturable absorber (SA). The different dynamical properties of the SA and of the gain create a window for regeneration only around the pulse.
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