The invention proposes the use of multiphoton intrapulse interference phase scan for laser pulse characterization. It also proposes a software for a laser system comprising a control unit (531) adapted to use the software for controlling the laser system, the software causing the control unit (531) to characterize a laser pulse based on introducing a reference phase function in the laser pulse. The invention also proposes a laser system operable for carrying out multiphoton intrapulse interference phase scan on a laser pulse, comprising a control unit (531) using the mentioned software for controlling the laser system.
