X-Ray Optics and Instrumentation / 2010 / Article / Fig 6

Review Article

Laue Gamma-Ray Lenses for Space Astrophysics: Status and Prospects

Figure 6

Measured rocking curve, in transmission geometry at 150 keV, of a Si(111) crystal curved at the University of Ferrara (see text). Δ 𝜃 gives the difference between the incidence angle of the monochromatic photon beam and the Bragg angle. Open circles: ratio between measured intensity of the diffracted beam and measured intensity of the transmitted beam (also called diffraction efficiency). Filled circles: difference between transmitted and diffracted intensities. Note that the angle Δ 𝜃 , through the Bragg law, is related to the reflected photon energy. Thus, the figure also shows the energy bandwidth of the curved crystal. Reprinted from [28], who tested the crystal sample.

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