A laser subsystem comprising at least the following optoelectronic elements: • a local oscillator emitting an optical beam in the form of laser pulse trains; • an energy amplification subsystem (42, 44, 45); • means of spatially and temporally formatting the optical beam (41, 43, 46); • and control, monitoring and measurement means (2, 3, 21, 22, 23, 24, 25, 26, 27, 31), characterized in that said subsystem comprises at least: • a semi-reflecting optical splitter placed at the output of the local oscillator; • a photodiode placed on one of the channels of said splitter so as to receive a part of the optical beam, said photodiode delivering an electrical signal representative of said optical beam; characterized in that said laser subsystem comprises an electronic device for generating synchronization signals designed to operate from the electrical signal taken from the photodiode and being used as the first external clock signal, said signal being emitted at a first oscillation frequency, said signal being supplied to an input, called clock input, said electronic device comprising at least: • first electronic means (110, 111, 112) for formatting the external clock signal so as to obtain a sinusoidal signal of frequency identical to the first oscillation frequency; • second electronic means for generating from said sinusoidal signal: ∘ a first periodic synchronization signal S 0 being used as a timebase reference, said signal having a first repetition frequency, said signal supplied to an electronic so-called reference output; ∘ a plurality of second periodic synchronization signals S SYNC having second repetition frequencies, said second signals being offset by a programmable time relative to the first synchronization signal, said second signals being supplied to electronic so-called programmed delay signal outputs. • a local oscillator emitting an optical beam in the form of laser pulse trains; • an energy amplification subsystem (42, 44, 45); • means of spatially and temporally formatting the optical beam (41, 43, 46); • and control, monitoring and measurement means (2, 3, 21, 22, 23, 24, 25, 26, 27, 31), characterized in that said subsystem comprises at least: • a semi-reflecting optical splitter placed at the output of the local oscillator; • a photodiode placed on one of the channels of said splitter so as to receive a part of the optical beam, said photodiode delivering an electrical signal representative of said optical beam; • first electronic means (110, 111, 112) for formatting the external clock signal so as to obtain a sinusoidal signal of frequency identical to the first oscillation frequency; • second electronic means for generating from said sinusoidal signal: ∘ a first periodic synchronization signal S 0 being used as a timebase reference, said signal having a first repetition frequency, said signal supplied to an electronic so-called reference output; ∘ a plurality of second periodic synchronization signals S SYNC having second repetition frequencies, said second signals being offset by a programmable time relative to the first synchronization signal, said second signals being supplied to electronic so-called programmed delay signal outputs. ∘ a first periodic synchronization signal S 0 being used as a timebase reference, said signal having a first repetition frequency, said signal supplied to an electronic so-called reference output; ∘ a plurality of second periodic synchronization signals S SYNC having second repetition frequencies, said second signals being offset by a programmable time relative to the first synchronization signal, said second signals being supplied to electronic so-called programmed delay signal outputs.