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Schematic of the double-clad Yb all-normal-dispersion fiber laser cavity and the setup for pulse characterization and adaptive compression via MIIPS (dash-line box). SMF-I and SMF-II: single mode passive fiber section I and II; QWP and HWP: quarter- and half-waveplates; PBS: polarizing beam splitter; OSA: optical spectrum analyzer; L1, 2, 3: plano-convex lenses.
