Fig. 1. Diagram of pulsed single-frequency fiber MOPA

Fig. 2. Experiment results. (a) Single pulse energy profiles corresponding to different active fiber configurations in main amplifier; (b) backward laser spectrum at single pulse energy of 0.59 mJ and PRF of 5 kHz

Fig. 3. Waveform at pulse energy of 0.024 mJ before entering main amplifier and waveform at maximum output energy of 0.59 mJ from main amplifier

Fig. 4. Laser spectral linewidth at maximum output energy of 0.59 mJ from main amplifier

Fig. 5. Laser spectrum at single pulse energy of 0.59 mJ and PRF of 5 kHz

Fig. 6. Beam quality measured at single pulse energy of 0.59 mJ