We demonstrate inline holography with a soft-x-ray vortex beam having an orbital angular momentum. A hologram is recorded as an interference pattern between a Bragg-diffracted wave from a fork grating and a divergent wave generated by a Fresnel zone plate. The images obtained exhibit fork-shaped interference fringes, which confirm the formation of a vortex beam. By analyzing the interference images, we successfully obtain a spiral phase distribution with a topological charge $\ell =\pm 1$. The results demonstrate that the inline-holography technique may be an effective probe for the characterization of topological defects in magnetic textures.

中文翻译：

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在线全息术检测的软X射线涡旋光束

我们演示了具有轨道角动量的软X射线涡旋光束的在线全息照相技术。全息图被记录为叉形光栅的布拉格衍射波与菲涅耳波带片产生的发散波之间的干涉图样。所获得的图像显示叉状干涉条纹，证实了涡旋光束的形成。通过分析干涉图，我们成功地获得了带有拓扑电荷的螺旋相位分布$\ell =\pm \mathrm{1个}$。结果表明，在线全息技术可能是表征磁性纹理拓扑缺陷的有效方法。