掺钕保偏光纤放大器的研究

Study of Nd^(3+)-doped polarization maintaining fiber amplifier

对掺钕双包层光纤放大器中抽运光和信号光沿光纤传播的功率分布进行了数值模拟,以808nm半导体激光器为抽运源,掺钕双包层保偏光纤为增益介质,对种子注入主振荡光纤放大器进行了理论分析和实验研究.利用实验室自制的皮秒锁模激光器为种子源,注入1064nm皮秒锁模脉冲,获得了稳定的放大脉冲.小信号时的放大倍数为300(增益为25dB),获得了平均功率5W的皮秒脉冲.同时利用TDS5104型示波器探测信号光放大前后的波形,并用光谱分析仪得到输出脉冲激光的光谱图.

The distribution of pump light and signal light power of Nd^3＋ -doped fiber amplifier along the fiber is numerically simulated. The Nd^3＋ -doped polarization-maintaining fiber amplifier is experimentally studied, which is pumped by 808 nm semiconductor laser. The enlargement factor of small-signal is 300（the gain is 25 dB）, and the steady 5 W amplificatory pulse is obtained by using the self-made Nd： YAG passive mode-locking laser as seed source. The 86142B-type spectrograph and TDS5104 oscillograph are employed to detect the output laser, and the output power is measured by power meter.