Q-switched pulse polarization-maintaining Nd3+-doped fiber laser

The Nd3+-doped pulse polarization-maintaining fiber laser pumped by 808 nut semiconductor laser is investigated experimentally and theoretically. The wave form of output pulse was detected by a TDS5104 oscillograph,and the spectrogram of the output pulse was obtained by using a spectrum analysis apparatus. Originally,the single pulse energy of 2.3 mJ with average power of 2.55 W was generated at the repetition rate of 1 kHz. By changing the resonance cavity and making other modificantions of the laser, we obtained the highest single pulse energy of 3.3 mJ with peak power of 17.9 kW at the repetition rate of 1 kHz, and the pulse width was 184 ns and the average power of the output pulse was 3.5 W.