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arXiv 1507.07959physics.optics
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真空中光的光的折射

Refraction of light by light in vacuum

X. Sarazin, F. Couchot, A. Djannati-Atai, O. Guilbaud, S. Kazamias, M. Pittman, M. Urban

摘要:

在强电磁场作用下,由于非线性量子电动力学(QED)特性,真空折射率将发生变化。已经提出了几种使用高强度激光的实验测试来观察真空中的电磁非线性,例如强激光脉冲的衍射或反射。我们提出了一种新的方法,它包括在观察折射,即旋转的探测激光脉冲穿过横向真空折射率梯度的波平面。后者是由两个非常强的超短激光脉冲相互作用产生的,用作泵浦脉冲。在折射率梯度的最大值处,探测脉冲的折射角被估计为$0.2 \times (\frac{w_0}{10 \mathrm{μm}})^{-3} \times \frac{I}{1 \mathrm{J}}$ ~皮弧度,其中$I$是两个泵浦脉冲的总能量,并且$w_0$是在相互作用区域处的最小腰部(fwhm)。假设LASERIX设备可获得的最强激光脉冲($I = 25$ ~J,30~fs fwhm持续时间,800~nm中心波长),并假设最小束腰为$w=10 \mathrm{μm}$(fwhm)(对应于$10^{21}$ ~W/cm $^2$量级的强度),预期的最大折射角约为5~皮弧度。一个实验装置,使用Sagnac干涉仪,建议进行这种测量。

英文摘要:

In very intense electromagnetic fields, the vacuum refractive index is expected to be modified due to nonlinear quantum electrodynamics (QED) properties. Several experimental tests using high intensity lasers have been proposed to observe electromagnetic nonlinearities in vacuum, such as the diffraction or the reflection of intense laser pulses. We propose a new approach which consists in observing the refraction, i.e. the rotation of the waveplanes of a probe laser pulse crossing a transverse vacuum index gradient. The latter is produced by the interaction of two very intense and ultra short laser pulses, used as pump pulses. At the maximum of the index gradient, the refraction angle of the probe pulse is estimated to be $0.2 \times (\frac{w_0}{10 \mathrm{μm}})^{-3} \times \frac{I}{1 \mathrm{J}}$~picoradians, where $I$ is the total energy of the two pump pulses and $w_0$ is the minimum waist (fwhm) at the interaction area. Assuming the most intense laser pulses attainable by the LASERIX facility ($I = 25$~J, 30~fs fwhm duration, 800~nm central wavelength) and assuming a minimum waist of $w=10 \mathrm{μm}$ (fwhm) (corresponding to an intensity of the order of $10^{21}$~W/cm$^2$), the expected maximum refraction angle is about 5~picoradians. An experimental setup, using a Sagnac interferometer, is proposed to perform this measurement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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