High dynamic range multi-channel cross-correlator for single-shot time contrast measurement

ハイダイナミックレンジマルチチャネルクロスコリレータによるシングルショット時間コントラスト計測

今 亮; 西内 満美子; 桐山 博光; 榊 泰直; 小倉 浩一; 福田 祐仁; 神門 正城; 近藤 公伯

Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Sakaki, Hironao; Ogura, Koichi; Fukuda, Yuji; Kando, Masaki; Kondo, Kiminori

Real-time temporal contrast of an ultrahigh-intensity laser pulse is a crucial parameter for laser plasma interaction experiments. We have developed a multi-channel cross-correlator (MCCC) for single-shot measurement of high temporal contrast (10) of Petawatt class laser pulse. The MCCC is based on a third order cross-correlator which is typically used in a delay-scanning mode, and has a four independent optical delay and channels. We have experimentally demonstrated that the MCCC system achieves the high dynamic range of 10 and large temporal window of 1 ns. Our technique is simple and powerful tool in order to measure shot-to-shot fluctuation of pre-pulse/pedestal mainly due to amplified spontaneous emission (ASE), in particular, for the large high-power laser system in low repetition-rate operation.