pre-pulses generated in this way can be up to 10 ns before the main pulse with energy ratios of up to 1:1. Figure 1: Measurement of the temporal contrast at the femtosecond front end with ultrafast parametric amplifier [...] amplifier (blue). The prepulses marked with arrows are artefacts of the measurement system. [1] Reference: [1] Y. Zobus, et al., High Power Laser Science and Engineering Vol. 11, e48 (2023), doi:10.1017/hpl [...] temporal contrast of the femtosecond front end a few ns before the actual pulse is shown in Figure 1. In addition, the contrast can be tailored to the special requirements of different experiments with