Differential Encoding Brings Higher Resolution to X-ray Lensless Holography

Figure 1, the concept of differential holography is similar to edge scans that are widely used to obtain the profile of a narrow beam. While fine slits are difficult to make, a sharp edge produced by very crude fabrication method can deliver surprisingly high resolution beam profile scans. Shown on the left is the schematics of a typical slit scan whose resolution is determined by the slit width, where as shown on the right, the edge scan resolution is determined by the edge sharpness.