The schematic layout of the picosecond fiber-solid hybrid amplifier. LD: laser diode; FBG: fiber Bragg grating; OC: optical coupler; SESAM: semiconductor saturable absorber mirror; WDM: wavelength-division-multiplexer; BPF: bandpass filter; YDF: Yb-doped fiber; SMF: single-mode fiber; ISO: isolator; HWP: half-wave plates; FR: Faraday rotator; QWP: quarter-wave plate; HR: high-reflectivity mirror; LD: fiber-coupled laser diode; M: mirror; TFP: thin-film polarizer.