Abstract We numerically demonstrate the generation of a very high peak power femtosecond pulse train by splitting a 1 ps, 100 kW pulse of central wavelength 2 μm using a few meters length of a large mode area fiber. The input 1 ps pulse during the propagation splits into multiple femtosecond pulses of very high peak powers. Concurrently, the spectral domain of the pulse also witnesses multiple peak formation. The used fiber is a W-type large mode area fiber, whose effective mode area can be varied from ~700 μm2 to ~1700 μm2 at 2 μm wavelength by varying the fiber parameters. The fiber design parameters were optimized for the efficient formation of femtosecond pulse train of peak powers ranging from ~100 kW to ~600 kW and FWHM ranging from ~100 fs to ~450 fs.

中文翻译：

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通过在 2 μm 波长的大模式面积光纤中进行脉冲分裂来生成飞秒脉冲序列

摘要 我们通过使用几米长的大模式面积光纤分裂中心波长为 2 μm 的 1 ps、100 kW 脉冲，从数值上证明了产生非常高的峰值功率飞秒脉冲序列。传播期间的输入 1 ps 脉冲分裂成多个峰值功率非常高的飞秒脉冲。同时，脉冲的谱域也见证了多个峰的形成。使用的光纤是 W 型大模式面积光纤，通过改变光纤参数，其有效模式面积可以在 2 μm 波长下从 ~700 μm2 变化到 ~1700 μm2。光纤设计参数经过优化，可有效形成峰值功率范围为 ~100 kW 至 ~600 kW 和 FWHM 范围为 ~100 fs 至 ~450 fs 的飞秒脉冲序列。