Figure 2.

The intensity pattern on the camera in the gBH interferometer of variant (b) at X-ray photon energy of 22.5 keV. The lines of the gratings were oriented horizontally and the grating period was 200 nm. As illustrated in figure 1, the width of the incident beam was limited to 160 μm by a slit. Given the propagation distance of 65 cm between the last grating and the camera, multiple diffraction bands are separated in the image. Two pairs of balanced diffraction paths gave rise to the interference fringes in the +1, +2 and −1, −2 bands.