Figure 4
Temporal electric field behaviour (a) calculated using the raw voltage data and (b) with a low-pass frequency filter applied to remove high-frequency electrical noise, and the contribution to the initial peak by optical self-emission coupled into the optical fibres subtracted. The time axes have been shifted such that t = 0 corresponds to the arrival of the 227 TW drive laser pulse on target. A 70th order Blackman-Harris window filter with a cut-off frequency of 250 MHz was chosen to minimize side-lobes and hence time-domain artefacts.
