**4. Conclusions**

This papers presents for the first time pressure measurements in a polymer confinement regime for 9 ns pulse duration at 532 nm wavelength up to 12.5 GW/cm<sup>2</sup> corresponding to the current laser parameters of LSP. Pressures were determined by coupling FE simulation and experimental measurements of rear free-velocity performed with VISAR.


Therefore, solid polymer confinements are an alternative to water for laser shock applications such as LSP. Further works will concern:


**Author Contributions:** This work was supervised by L.B. The experiments on Hephaistos' facility were conducted by C.L.B., A.R., M.S.-B., and L.B., with Y.R.'s technical support. The design and manufacture of the polymers were done by B.F., M.G., and C.L.B. The simulations were made by R.S. under the supervision of L.M., L.V., R.E., and S.V., and D.F. participated in the exploitation and design of the Hephaistos experiments.

**Funding:** This study was supported by the Authors' affiliate companies (Airbus and Thales) and institutions (CEA, CNRS, and ENSAM) and Agence pour la Recherche Forge Laser.

**Conflicts of Interest:** Authors declare no conflict of interest.
