Figure 2

Electro-optic encoding and EM pulse detection. Signal detection at different delays (Δt₁ < Δt₂ < Δt₃) between the probe and the main pulses. The probe laser enters into the crystal from left to right (earlier times on the left). The blue shaded area represents the size of the crystal not affected by EO effect (probe in advance with respect to the EM pulse). The probe is temporally synchronized with the EM pulse (with duration σ _t ) only on the remaining part, i.e. only a part of its front-wave (whose size is proportional to the target emitting area Δx) is detected.