A device producing laser pulses of durations smaller than 30 ns, and including along its internal optical axis: a laser resonator of optical length smaller than 2 m including two reflecting ends and incorporating an MPF photonic fiber pumped continuously by at least one pump wave with laser diodes, the laser medium being a medium where the laser wave is guided and has a gain with very weak signal greater than 10 per passage, the resonator also incorporating an optical modulator. The optical modulator may deflect the internal laser axis via an electric control along two stable directions, the first direction corresponding to an axis along which the internal laser beam undergoes sufficient losses to prevent the laser effect, the second direction corresponding to an axis along which the laser beam is reflected towards itself at least partially by an optical return element.