为了满足相干探测技术对激光光源的需求, 采用主振功率放大技术, 对全光纤、高重复频率、1550nm单频脉冲光纤激光器进行了研究。得到了脉冲宽度400ns、重复频率10kHz、单脉冲能量14μJ、平均功率148mW的单模光纤激光脉冲输出。实验中还发现了光纤中过高的功率密度所引起的受激布里渊散射(SBS)将导致激光脉冲波形的变形。提出了抑制SBS效应、提高输出功率的方法。结果表明, 单频脉冲放大过程中, SBS效应是阻碍功率提高的主要因素, 必须抑制SBS效应才能提高输出功率。

In order to meet the requirements of coherent detection, a high power, single frequency, 1550nm pulsed fiber laser was studied based on all-fiber master oscillator power amplifier technique. A single mode pulsed laser was obtained with 400ns pulse duration, 10kHz pulse repetition rate, 148mW average power and 14μJ pulse energy. It was also found that the pulse shape was destroyed by the stimulated Brillouin scattering (SBS) resulting from the higher power density in the fiber. Then a way was put forward to suppress the SBS effect. The experimental results show that the SBS must be suppressed in order to improve the power.