高功率掺Yb3+大模场光纤放大器实验研究

摘要

In order to study the property of high power fiber amplifiers,the output energy of 10μm and the peak power of 2.4kW were obtained respectively after the shaped signal pulse is amplified by a two-stage fiber amplifier.However,the pump power was larger than 1.4W,the output energy became unstable and giant pulse was detected.It was found that the output signal was not saturated and there was lots of residual energy in the fiber even the output signal was large up to a few kW.Higher power can be obtained if the design of the fiber amplifier was optimized.The Yb-doped large-mode-area fiber amplifier was simulated,and the result was identical with the experiment result.%为了研究高功率光纤放大器的工作特性,采用两级光纤放大器对整形脉冲进行放大,得到放大后的脉冲能量为10霬、峰值功率为2.4kW.发现当抽运功率高于1.4W时,输出功率变得很不稳定,甚至出现了能量很高的巨脉冲.模拟了掺Yb3+大模场光纤放大器,模拟结果与实验结果吻合较好.结果表明,信号光峰值功率放大到几千瓦时尚未饱和,光纤内仍有很多剩余储能,重新对放大器的设计进行优化,可以获得更高的能量.