Laser beams

The main component of this Research Infrastructure is a multipetawatt laser, based on the Chirped Pulse Amplification (CPA), qui a valu à Gérard MOUROU le prix Nobel de physique en 2018. It made up:

An OPCPA front-end (Optical Parametric Chirped Pulse Amplification) using advanced technology and barium beta-borate (BBO) to generate laser pulses with high spectral bandwidth and high contrast. The non-colinear architecture [D. Papadopoulos et al., Optics Lett. 42, 3530 (2017)] implements an original XPW device (crossed-polarized-wave) original [L. Ramirez et al., J.O.S.A. B 30, 2607 (2013)]. It reliably delivers high quality pulses, with a contrast of more than 1012 and a bandwidth compatible with a duration less than 10fs;
An Offner stretcher;
• A 4 stages of Titanium Sapphire allowing to deliver nano-second pulses with an energy up to 330 Joules at a rate of 1 shot per minute.

At the output amplification, a separation system allow to deliver a set of laser beams, superposable on the same focal spot and synchronizables, with a maximum energy on target of 265 J:

An ultra-intense main laser beam “F1” delivering pulses of 15fs with a maximum energy of 150J, i.e. a 10PW peak power;
An intense secondary laser beam “F2”, delivering pulses of 15fs with a maximum energy of 150J, i.e. a 1PW peak power;
A “creation” laser beam “F3”, delivering nano-second pulses with a maximum energy of 250J;
A probe laser beam “F4”, delivering pulses of 20fs with a maximum energy of 250mJ (i.e. 10 TW).

Vue du transport du faisceau 1PW en salle poste amplification
View of the 1 PW beam’s transport in post amplifciation room – © Dimitri Papadopoulos

Finally, before beams’ distribution in experimental area, a complet set of laser diagnostics allows to know the main characteristics of the beam at the time of the shooting (energy, pulse duration, spectrum, spatial phase, contrast).

Tableau récapilatif des performances laser de l'installation Apollon
APOLLON facility laser beams’ characteristics