高功率脉冲抽运Er-Yb共掺光纤放大器的理论研究  

Theoretical Investigation of High-Power Pulse-Pumped Er-Yb Codoped Fiber Amplifiers

作　　者：吕晓英[1,2] 韩群[1,2] 刘铁根[1,2] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]光电信息技术教育部重点实验室(天津大学),天津300072

出　　处：《中国激光》2014年第6期22-27,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61107035);天津市自然科学基金(13JCYBJC16100)

摘　　要：基于速率方程理论对低重复频率高功率脉冲抽运Er-Yb共掺光纤放大器(EYDFA)进行了理论研究。通过采用有限差分法对理论模型的求解,系统分析了在放大自发辐射(ASE)受限情况下,抽运脉冲峰值功率、抽运脉宽、信号时延对放大器性能的影响。结果表明,在将ASE控制在合理范围的情况下,抽运脉冲存在一个最佳的抽运脉冲宽度,信号脉冲相对抽运脉冲的时延对输出峰值功率和脉冲能量有非常重要的影响。而且对给定的增益介质,抽运脉冲峰值功率也并非越高越好,而是存在一个最佳值。该研究结果对高功率脉冲抽运Er-Yb共掺光纤放大器的实验研究具有指导意义。Low-repetition rate high-power pulse-pumped Er-Yb codoped fiber amplifiers （EYDFAs） are theoretically investigated. By numerically solving the rate-equations of EYDFAs with finite difference method, in the case of limited amplified spontaneous emission （ASE）, the impact of the peak-power and pulse-width of pump pulse and time- delay between signal and pump pulse on the performance of the amplifier are systematically analyzed. The results show that the pulse width of pump pulse and the time delay between the signal and pump pulses have significant impact on the performance of EYDFA. They can be optimized by controlling the power of the ASE in a reasonable range. For a given gain medium, a low peak power long pump pulse is generally better than a high peak power short pulse, and there is an optimum value. These results are of great importame in high-power pulse-pumped Er-Yb codoped fiber amplifies.

关 键 词：激光器 铒镱共掺光纤 有限差分法 光纤放大器 脉冲抽运 

分 类 号：TN241[电子电信—物理电子学]