All Optical-Parametric-Amplification Technic Based High-Energy Laser Front-End

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 $\mu\mathrm{J}-\text{range}$ 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.