Megawatt peak power Mamyshev oscillator seeded by sub-nanosecond pulses either at 1064 nm or 1033 nm Riccardo Gotti, Sara Pizzurro, Luca Carrà, Antonio Agnesi and Federico Pirzio EPJ Web Conf., 307 (2024) 02006 Published online: 18 October 2024 DOI: 10.1051/epjconf/202430702006