(color online) Experimental setup of an all-fiber master oscillator power amplifier with the low-repetition-rate all-PM fiber seed and a three-stage amplifier. PM: polarization-maintaining, ISO: isolator, WDM: wavelength division multiplexer, Yb: Yb-doped fiber, MFA: mode field adapter, MM fiber: multimode fiber, LMA fiber: fiber with large mode area, CPS: cladding power stripper.