论文部分内容阅读
基于时分复制脉冲放大的理论模型,数值研究了五级双折射晶体组级联时分复制光纤放大系统中各参数对皮秒放大脉冲特性的影响。结果表明,子脉冲之间非线性相移积累的不同会导致耦合效率降低。当时分复制后子脉冲间距大于2.5倍脉宽时,子脉冲串耦合效率达到最优。在光纤放大器非线性系数和最大增益一定的条件下,为获得峰值功率为10 MW的变换极限皮秒放大脉冲,给出了种子脉冲峰值功率和增益光纤长度的选择范围。在光纤长度确定的条件下,为了降低晶体偏转角和透射率对放大脉冲性能的影响,应选择低峰值功率的种子脉冲和高增益的光纤。
Based on the theoretical model of time-multiplexed pulse amplification, the effects of various parameters on the picosecond amplification pulse characteristics of five-stage birefringent crystal group cascaded time-division optical fiber amplification system are studied numerically. The results show that the different accumulation of non-linear phase shifts between sub-pulses leads to a decrease of the coupling efficiency. At that time, when the sub-pulse spacing is greater than 2.5 times the pulse width, the sub-burst coupling efficiency is optimal. In order to obtain the conversion limit picosecond amplification pulse with peak power of 10 MW under the condition of non-linearity coefficient and maximum gain of the fiber amplifier, the selection range of the peak power of the seed pulse and the gain fiber length is given. In order to reduce the effect of crystal deflection angle and transmittance on the amplifying pulse performance, a low peak power seed pulse and a high gain fiber should be selected under the conditions of the fiber length.