基于啁啾补偿技术的自相似脉冲压缩光纤设计

为了获得高功率优质的超短脉冲光源，利用色散渐增光纤产生的强线性啁啾对自相似脉冲进行了啁啾补偿光纤设计。首先利用色散补偿光纤得到了半峰全宽为52.6fs、峰值功率为684.5W的超短脉冲输出。在此基础上研究了色散渐增的补偿光纤设计，讨论了色散线性渐增光纤和色散指数渐增光纤对自相似脉冲的压缩影响。当色散渐增系数取1km-1，5km-1，10km-1时，通过数值仿真得出了最短的输出脉宽、峰值功率以及所需的补偿光纤长度。结果表明，色散渐增光纤能缩短补偿光纤的长度，减小脉冲压缩时产生的损耗，得到半峰全宽为61.8fs和64.4fs的高功率超短脉冲输出。这一结果对自相似脉冲压缩光纤的设计是有帮助的。

Design of self-similar pulse compression fiber based on chirp compensation technology

In order to obtain high power and high quality ultrashort pulse light source, the chirp compensation fiber design of self-similar pulse was studied for the first time using strong linear chirp generated by the dispersion decreasing fiber (DDF). Firstly, the ultra-short pulse output with half height full width of 52.6fs and peak power of 684.5W was obtained by using dispersion compensation fiber. On this basis, the design of dispersion increasing compensation fiber was studied, and the effects of dispersion-linear-increased fiber and dispersion-exponential-increased fiber on the compression of self-similar pulses were emphatically discussed. When the dispersion increasing coefficient was respectively set to 1km-1, 5km-1, 10km-1, the shortest output pulse width, peak power and the required compensated fiber length were obtained by numerical simulation. The results show that the dispersion increasing fiber can shorten the length of the compensated fiber greatly, which is beneficial to reduce the loss caused by pulse compression, and finally obtain high power ultrashort pulse output with half height full width of 61.8fs and 64.4fs. This result is helpful to the design of self-similar pulse compression fiber.