Millijoule-level sub-cycle pulses from two channels of a parallel parametric waveform synthesizer Fabian Scheiba, Giulio Maria Rossi, Roland E. Mainz, Yudong Yang, Giovanni Cirmi and Franz X. Kärtner EPJ Web Conf., 205 (2019) 01011 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920501011