Fig. 1. Schematic of experimental setup.(a) Ytterbium-doped fiber amplifier system; (b) function realization block diagram of pulse picker

Fig. 2. Pulse burst profile with a rectangular shape. (a) Temporal profile of the amplified pulse burst with 150 ns burst duration; (b) radio frequency spectrum of the amplified burst train; (c) optical spectrum of the output pulse bursts from the AOM and three stage amplifiers; (d) autocorrelation traces of the compressed pulse from the main amplifier

Fig. 3. Temporal profile of the amplified pulse burst on 500 ns bursts duration with different programming shapes. (a) A stair shape; (b) a sine shape; (c) a concave slope shape; (d) an exponential shape

Fig. 4. Optical spectrum of AOM, first-stage amplifier YDF1, second-stage amplifier YDF2, and third-stage rod fiber amplifier output pulse train spectrum after pulse compression. (a) A stair shape; (b) a sine shape; (c) a concave slope shape; (d) an exponential shape

Fig. 5. Intensity autocorrelation curves of the compression pulse from the main amplifier with 1 μJ pulse energy are fitted by hyperbolic secant square function within 5 ps time span. (a) A stair shape; (b) a sine shape; (c) a concave slope shape; (d) an exponential shape

Fig. 6. Two-dimensional beam display of amplified pulse train