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Proton acceleration experiments were carried out by a 1.2×10~(18)W/cm~2 ultra-short laser interaction with solid foil targets.The contrast ratio between amplified spontaneous emission(ASE)intensity and the peak intensity of the main laser pulse was measured by the SEQUOIA of amplitude technologies.The contrast ratio of the ASE pedestal was 10~6 up to 30 ps before the main
Proton acceleration experiments were carried out by a 1.2 × 10 ~ (18) W / cm ~ 2 ultra-short laser interaction with solid foil targets. The contrast ratio between amplified spontaneous emission (ASE) intensity and the peak intensity of the main laser pulse was measured by the SEQUOIA of amplitude technologies. The contrast ratio of the ASE pedestal was 10 ~ 6 up to 30 ps before the main