真空中的光衍射
Light by light diffraction in vacuum
摘要：
我们表明，由于量子真空效应，激光束可以被更集中的光脉冲衍射。我们解析计算的强度图案在一个现实的实验配置，并讨论它如何可以用来测量第一次描述在真空中的光子-光子散射的参数。特别是，我们表明，量子电动力学预测可以检测到在未来的100拍瓦激光器，如ELI或HIPER的单次实验。另一方面，如果在目前的高功率设施之一，如OMEGA EP，这个建议可以导致发现非标准物理，或大大提高目前的PVLAS限制的光子-光子截面在光学波长。这个通过光操纵光的新例子比现有的替代方案更容易实现，也更灵敏，并且也可以用于测试Born-Infeld理论或寻找轴子或微荷电粒子。
英文摘要：
We show that a laser beam can be diffracted by a more concentrated light pulse due to quantum vacuum effects. We compute analytically the intensity pattern in a realistic experimental configuration, and discuss how it can be used to measure for the first time the parameters describing photon-photon scattering in vacuum. In particular, we show that the Quantum Electrodynamics prediction can be detected in a single-shot experiment at future 100 petawatt lasers such as ELI or HIPER. On the other hand, if carried out at one of the present high power facilities, such as OMEGA EP, this proposal can lead either to the discovery of non-standard physics, or to substantially improve the current PVLAS limits on the photon-photon cross section at optical wavelengths. This new example of manipulation of light by light is simpler to realize and more sensitive than existing, alternative proposals, and can also be used to test Born-Infeld theory or to search for axion-like or minicharged particles.
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