In most techniques used for the temporal characterization of high-repetition rate ultrafast lasers, the resulting measurement is usually integrated over a large number of pulses. Shot-to-shot fluctuations within the pulse train are therefore averaged in the acquisition. These variations may be of a different nature depending on the laser source and the nonlinear processes involved. In previous works, some of these techniques were tested through numerical simulations and their sensitivity to this phenomenon - known as the coherent artifact - has been analyzed by adding random phases to the pulses and by introducing multiple pulse instabilities in the pulse train [1-3].

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