In this work, a theoretical model is discussed to investigate the performance of a core-engineered gas-filled hollow-core photonic crystal fiber (HC-PCF). To gain the shortest pulse width and the best beam quality at the output, the core geometry of the fiber is modified within four specific types referred to as type I to type IV fibers. It is found that, by using type III and type IV HC-PCF devices, a 5 ps laser pulse in the input can be respectively compressed to 18.5 fs and 13.7 fs at the output. It is found that, a 5-ps laser pulse in the input can be reduced to 18.5 fs and 13.7 fs if type III- and type IV of modified HC-PCF device are respectively used for compression. The structural similarity (SSIM) index is used to evaluate the quality of the beam cross-section that ultimately emerges from the end of the fiber. The results suggest that the highest SSIM value of 0.76 can be obtained if type III HC-PCF is employed for pulse compression.

在这项工作中，讨论了一个理论模型来研究核心工程充气空芯光子晶体光纤 (HC-PCF) 的性能。为了在输出端获得最短脉冲宽度和最佳光束质量，光纤的纤芯几何形状在四种特定类型中进行了修改，称为 I 型到 IV 型光纤。结果表明，通过使用III型和IV型HC-PCF器件，输入端的5 ps激光脉冲可以分别压缩到输出端的18.5 fs和13.7 fs。结果表明，如果分别使用改进型HC-PCF器件的III型和IV型进行压缩，输入中的5ps激光脉冲可以降低到18.5 fs和13.7 fs。结构相似性 (SSIM) 指数用于评估最终从光纤末端出现的光束横截面的质量。