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Paper detail

Spatiotemporal focusing does not always improve axial intensity localization

We report on an experimental comparison on critical intensities of nonlinear self-focusing in air with conventional focusing and spatiotemporal focusing schemes. Our results show that the conventional focusing with the focal lens completely filled with the incident beam allows for the strongest axial intensity confinement against the self-focusing effect. This is because that in the high-numerical-aperture condition, the focal spot will have a compact size which results in a high focal intensity. Meanwhile, the Rayleigh length of the focused beam will be substantially shortened which efficiently postpones the onset of self-focusing.

preprint2015arXivOpen access
Ya ChengHongqiang XieZhaohui WangGuihua LiBin ZengFei HeWei ChuJinping YaoLingling Qiao
physics.optics
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Ya ChengHongqiang XieZhaohui WangGuihua LiBin ZengFei HeWei ChuJinping YaoLingling Qiao

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