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arXiv 1809.07519physics.optics
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充气单环光子晶体光纤中飞秒电离引起的长寿命refractive index变化

Long-lived refractive index changes induced by femtosecond ionization in gas-filled single-ring photonic crystal fibers

Johannes R. Koehler, Felix Köttig, Barbara M. Trabold, Francesco Tani, Philip St. J. Russell

摘要:

研究了充气空芯光子晶体光纤中飞秒光电离引起的折射率变化。使用空间分辨干涉侧探测,我们发现,这些变化的光电离事件后几十微秒-八个数量级的脉冲持续时间长。同时观察到兆赫频率范围内的振荡,这是由围绕中空芯的薄壁毛细管的机械振动引起的。这两种非局部效应可以影响在其寿命内到达的第二脉冲的传播,其重复频率为数十千赫。在光纤中填充原子级较轻的气体可以显著降低电离,从而减轻折射率变化的强度。当连续激光脉冲之间的时间非局部相互作用变得相关时,该结果对于理解在高强度和高重复率下操作的气体基光纤系统的动力学将是重要的。

英文摘要:

We investigate refractive index changes caused by femtosecond photoionization in a gas-filled hollow-core photonic crystal fiber. Using spatially-resolved interferometric side-probing, we find that these changes live for tens of microseconds after the photoionization event - eight orders of magnitude longer than the pulse duration. Oscillations in the megahertz frequency range are simultaneously observed, caused by mechanical vibrations of the thin-walled capillaries surrounding the hollow core. These two non-local effects can affect the propagation of a second pulse that arrives within their lifetime, which works out to repetition rates of tens of kilohertz. Filling the fiber with an atomically lighter gas significantly reduces ionization, lessening the strength of the refractive index changes. The results will be important for understanding the dynamics of gas-based fiber systems operating at high intensities and high repetition rates, when temporally non-local interactions between successive laser pulses become relevant.

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