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(a) A CAD drawing of the PtyNAMi scanner unit, including the X-ray lenses, pinhole, kinematic sample mount and optical interferometers. (b) A photograph showing the sample holder with an integrated ball lens as retroreflector. The three interferometer heads point towards the ball lens and can be aligned using a stack of three SmarAct stages. (c) A sketch of the working principle of a transparent ball lens acting as a retroreflector if its optical refractive index n is close to 2.
