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首页> 外文会议>X-Ray FEL Optics and Instrumentation 30-31 July 2000 San Diego, USA >Focusing coherent x-rays with refractive optics
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Focusing coherent x-rays with refractive optics

机译：用折射光学仪聚焦相干X射线

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摘要

Refractive lenses have been used successfully to focus incoherent x-ray emission in the wavelength range from 2 to 5 A with focal lengths on the order of one meter. A stack of N lens elements is employed to reduce the focal length by the factor N over a single element, and such a lens is termed a Compound Refractive Lens (CRL). Contrary to intuition, misalignment of parabolic lens elements doesn't alter the focusing prperties and results in only a small reduction in transmission. Coherent x-ray sources are being developed with wavelengths of 1-1.5 A and source diameters of 50-80 mum, and the CRL is ideally suited to produce a small, intense image. Chromatic abserration increases the size of the image and so it is important to porvide chromatic correction to minimize the image dimensions. Pulse broadening due to the dispersion of the lens material is negligible. Intensity gain is in the range from 10~5 to 10~6, where gain is defined as the intensity ratio in an image plane with and without the lens in place. Maximum image intensity is obtained when the CRL is placed a distance of 100 to 200 m from the source, and the typical diameter of the focused spot is about one micron.
机译：折射透镜已成功用于聚焦2至5 A波长范围，焦距约为1米的非相干X射线发射。使用N个透镜元件的堆栈来将焦距减小单个元件的N倍，这种透镜称为复合折射透镜（CRL）。与直觉相反，抛物线透镜元件的未对准不会改变聚焦特性，只会导致透射率的小幅下降。相干x射线源的波长范围为1-1.5 A，源直径为50-80 mum，CRL非常适合产生较小的强烈图像。色差会增加图像的大小，因此重要的是要进行色彩校正以最大程度地减小图像尺寸。由于透镜材料的分散而引起的脉冲展宽可以忽略不计。强度增益在10〜5到10〜6的范围内，其中增益定义为在有透镜和没有透镜的情况下图像平面中的强度比。当将CRL放置在距光源100到200 m的位置时，可以获得最大的图像强度，并且聚焦点的典型直径约为1微米。

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