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arXiv 1808.07019physics.optics
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坍缩光束的偏振损失

Loss of Polarization in Collapsing Beams

Gauri Patwardhan, Xiaohui Gao, Amir Sagiv, Avik Dutt, Jared Ginsberg, Adi Ditkowski, Gadi Fibich, Alexander Gaeta

摘要:

我们从理论上和实验上证明,塌缩椭圆偏振激光束经历的非线性椭圆旋转,是高度敏感的输入功率的小波动。对于输入功率的任意小的波动,并且在足够大的传播距离之后,偏振角从一个镜头到另一个镜头变得均匀地分布在[0,2 $π$ ]中。我们称这种新现象为“偏振损失”。我们在熔融石英玻璃,氮气和水进行实验,并观察到一个显着增加的椭圆偏振飞秒脉冲的输出偏振角的波动作为功率增加超过自聚焦的临界功率。我们还显示数值和实验证实,这种效果是更突出的异常群速度色散(GVD)制度相比,正常的GVD制度,由于延长长度的灯丝为前者。这种效应可能在利用椭圆偏振脉冲的强场光-物质相互作用中发挥重要作用。

英文摘要:

We show theoretically and demonstrate experimentally that collapsing elliptically-polarized laser beams experience a nonlinear ellipse rotation that is highly sensitive to small fluctuations in the input power. For arbitrarily small fluctuations in the input power and after a sufficiently large propagation distance, the polarization angle becomes uniformly distributed in [0, 2$π$] from shot-to-shot. We term this novel phenomenon 'loss of polarization'. We perform experiments in fused-silica glass, nitrogen gas and water, and observe a significant increase in the fluctuations of the output polarization angle for elliptically-polarized femtosecond pulses as the power is increased beyond the critical power for self-focusing. We also show numerically and confirm experimentally that this effect is more prominent in the anomalous group-velocity dispersion (GVD) regime compared to the normal-GVD regime due to the extended lengths of the filaments for the former. Such effects could play an important role in intense-field light-matter interactions in which elliptically-polarized pulses are utilized.

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