Helmut Lotsch

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We describe an x-ray interferometer optimized for operation with synchrotron radiation at the storage ring DORIS at DESY, Hamburg. Function principles, design, and manufacture are discussed. Interference fringes are created by scanning the analyzer crystal of the instrument in increments below 0.1 Å. Special attention is paid to minimize warping due to(More)
An elementary theory for beam waveguides based upon geometrical optics as well as upon the HUYGENS undulatory theory is developed. A homogeneous FREDHOLM integral equation of the first kind is derived. It connects the field distribution as observed on a mathematical surface behind the n-th lens with the given initial distribution. If the spacing between the(More)
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