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![[Figure 1]](te5086fig1mag.jpg)
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Figure 1
(a) Schematic of the configuration for pump–probe DFXM imaging of a strain wave used for the simulations. A crystallographic coordinate system indicates the diamond orientation. An optical laser (pump) heats a deposited Au film. This leads to thermal expansion and the launching of a strain wave (red plane) into the diamond. An incident X-ray beam (probe) is condensed into a sheet which penetrates the diamond crystal at some time delay after the laser excitation. A laboratory coordinate system (xℓ, yℓ, zℓ) is defined with xℓ, yℓ and zℓ parallel to the incident beam width, height and propagation direction, respectively. The diamond crystal is oriented such that the {111} planes Bragg scatter, and an objective lens is positioned in the Bragg-scattered beam. This results in a magnified image of a field of view (FoV) (white dashed lines) being projected onto the detector. The colorscale shows the photon count in a simulated image (see Section 3.2 ![[link]](../../../../../../logos/arrows/j_arr.gif) ). (b) The upper-left inset shows a top-down view of the setup. We assume the sample is mounted on a goniometer which can perform an ω rotation around the local diffraction vector Q and two orthogonal tilts, χ and ϕ. The angle β between the wavevector of the strain wave ksound and the diffraction vector Q is indicated. (c) The simulated 1D strain-wave profile (see Section 3.1) is shown in the inset with dark dashed lines. |
![[Figure 1]](te5086fig1.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
