Figure 5
From: A 300 THz tabletop radar range system with sub-micron distance accuracy
RCS calibration of the optical setup using the reflection from chrome spheres. Data are black dots, theoretical values is red line. Inset: picture of the 5 ball bearing spheres on top of a glass plate. The 0.5 mm diameter sphere is illuminated by the Ti:Sapph laser. Bottom spheres are reflection from the substrate.
