Power scaling of LED-pumped alexandrite: The road to high gain multipass amplifiersElio Thellier, Hussein Taleb, Catherine Le Blanc, Pierre Pichon, Frédéric Druon, Patrick Georges and François BalemboisEPJ Web Conf., 307 (2024) 04029DOI: https://doi.org/10.1051/epjconf/202430704029