Towards direct nonlinear compression of long-pulse lasers to the femtosecond regime Gaspard Beaufort, Nayla Jimenez, Victor Hariton, Ayhan Tajalli, Ingmar Hartl and Marcus Seidel EPJ Web Conf., 307 (2024) 04038 Published online: 18 October 2024 DOI: 10.1051/epjconf/202430704038