Fig. 1. Schematic of picosecond pulse fiber front end

Fig. 2. Output pulse characteristics of the laser. (a) Measured pulse train; (b) Measured RF spectrum of the pulse train with resolution bandwidth of 100 Hz, measured span of 1 MHz, and the inset shows the higher harmonics with resolution bandwidth of 1 kHz

Fig. 3. Output single pulse characteristics of the laser. (a) Output spectrum; (b) Intensity autocorrelation trace

Fig. 4. Output characteristics after amplification. (a) Amplifier output power versus pump power; (b) Output spectrum after amplification with 0.7, 1.2, 1.5 m doped fiber, and the spectrum FWHM are 0.27, 0.31, 0.32 nm respectively;(c) Photo of the packaged prototype