Sub-50 fs, µJ-level pulses from a Mamyshev oscillator–amplifier system Repgen, Paul ; Wandt, Dieter ; Morgner, Uwe ; Neumann, Jörg ; Kracht, Dietmar Abstract Publication: Optics Letters Pub Date: December 2019 DOI: 10.1364/OL.44.005973 Bibcode: 2019OptL...44.5973R