Figure 2

Recorded fringe patterns after a double slit in the refocused beam. Panels (a–d) show characteristic fringe patterns measured for different slit distances d as indicated in the panels. The inset in panel (a) shows an example of the raw data captured on the CCD featuring well resolved fringes. (e) Modulus of the complex coherence factor |µ 12 | for different slit distances along the horizontal axis of the laser. The dotted line shows a Gaussian fit with a width at full width half maximum of 3.13 µm.