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脉冲堆积技术是高功率激光系统中产生任意种子脉冲的方案之一。该方案利用大啁啾光纤布拉格光栅的宽带特性来展宽宽带短脉冲,以满足脉冲堆积组件的需求。利用传输矩阵法模拟了大啁啾宽带光纤布拉格光栅的反射谱、时延曲线等特性。研究发现,光纤光栅的啁啾因子决定了色散量以及带宽的大小,但增加色散量的代价是降低了光纤光栅的带宽;光栅长度越长,反射带宽明显增加,但色散量变化不大。研究结果对高功率前端系统的设计具有一定的指导意义。
Pulse stacking technology is one of the schemes to generate arbitrary seed pulses in high power laser systems. The solution utilizes the broadband characteristics of a large chirped fiber Bragg grating to broaden the broadband bursts to meet the needs of the pulse stacker. The transmission matrix method was used to simulate the characteristics of the reflection spectrum and time delay of the large chirp broadband fiber Bragg grating. It is found that the chirp factor of FBG determines the amount of chromatic dispersion and the size of the bandwidth. However, the cost of adding chromatic dispersion decreases the bandwidth of FBG. The longer the grating length, the larger the reflection bandwidth, but the smaller the chromatic dispersion. The research results have certain guiding significance for the design of high power front-end system.