An analyser for analysing the spatial intensity distribution of a focused pulsed laser beam in a focal plane, which comprises, downstream of this plane and on the optical path: - a shaping lens, - a device for partially sampling the shaped beam, - a heat sink adapted to absorb the unsampled beam and to provide an absolute measurement of the laser energy and power thereof, - an image sensor, - an imaging lens able to form images of the plane on an image sensor, - a photodiode, separate from the heat sink, placed on the path of the unsampled beam at the heat sink and configured to perform, using synchronisation electronics, an autonomous synchronisation configured so as to allow a temporal analysis of pulses to be carried out and an image capture, by the image sensor, to be triggered at a chosen time during the duration of a pulse, said photodiode being further calibrated against the measurements provided by the heat sink in order to perform an absolute measurement of the energy, - a motorisation of the shaping lens able to translate this lens along the axis of the optical path, - a motorisation of the imaging lens able to translate this lens in a plane perpendicular to the axis of the optical path, - a motorisation of the image sensor able to translate this sensor along the axis of the optical path, - electronics for controlling each motorisation, and - the electronics for synchronising the image sensor, which are connected to the photodiode, which are adapted to provide said autonomous synchronisation, - electronics for adjusting the aperture and/or the gain of the image sensor, and - a software interface for parameterising and piloting these controlling, synchronising and adjusting electronics, which is equipped with a unit for processing the images acquired by the sensor. - a shaping lens, - a device for partially sampling the shaped beam, - a heat sink adapted to absorb the unsampled beam and to provide an absolute measurement of the laser energy and power thereof, - an image sensor, - an imaging lens able to form images of the plane on an image sensor, - a photodiode, separate from the heat sink, placed on the path of the unsampled beam at the heat sink and configured to perform, using synchronisation electronics, an autonomous synchronisation configured so as to allow a temporal analysis of pulses to be carried out and an image capture, by the image sensor, to be triggered at a chosen time during the duration of a pulse, said photodiode being further calibrated against the measurements provided by the heat sink in order to perform an absolute measurement of the energy, - a motorisation of the shaping lens able to translate this lens along the axis of the optical path, - a motorisation of the imaging lens able to translate this lens in a plane perpendicular to the axis of the optical path, - a motorisation of the image sensor able to translate this sensor along the axis of the optical path, - electronics for controlling each motorisation, and - the electronics for synchronising the image sensor, which are connected to the photodiode, which are adapted to provide said autonomous synchronisation, - electronics for adjusting the aperture and/or the gain of the image sensor, and - a software interface for parameterising and piloting these controlling, synchronising and adjusting electronics, which is equipped with a unit for processing the images acquired by the sensor.