Figure 3 | Scientific Reports

Figure 3

From: Jitter-free 40-fs 375-keV electron pulses directly accelerated by an intense laser beam and their application to direct observation of laser pulse propagation in a vacuum

Figure 3

Laser pulse energy and contrast ratio dependence of the charge of the electron pulse. The charge of electron pulses with an energy of 375 keV detected using the fluorescent screen is plotted. To increase the charge, the pulse contrast ratio of the driving laser was adjusted by changing the input energy from the oscillator to the amplifier in the CPA laser system. For the input energy of 340 mW, the contrast ratio was 10−7. The input energies of 30 and 110 mW correspond to changing the contrast ratio by 11-fold and 3.1-fold compared with contrast ratio at an input energy of 340 mW. The results obtained using a plasma mirror48, which improved the contrast ratio from 10−7 to 10−9, are also shown (see Methods).

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