Abstract

Temporal pulse contrast [1], defined as ratio between the peak of a pulse and its pedestal on a hundred picoseconds time range, is a key parameter for laser-matter interaction on UHI (Ultrahigh Intensity) laser system. In this context, we aim to develop a high-energy (> 200 mJ) laser front-end which delivers more than 8-nm-spectral-bandwidth pulses with a central wavelength of 1053 nm and a 2-Hz-repetition-rate. In order to get high temporal contrast, this front-end is based on parametric amplification process. The first part of the front-end consists of a µJ-range FOPCPA (Fiber-Optical Parametric Chirped-Pulse Amplification) [2,3] source, followed by a free-space OPCPA (Optical Parametric Chirped-Pulse Amplification) [4] based power-amplifier.

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