Fig. 6
From: Ring-shaped bifocal lens used for fluorescent self-referenced holographic imaging
The scheme of the RBL based self-referenced holographic microscope setup. The objective collimates the light of a point source. This light beam is spatially divided by the RBL. The colour filter (CF) is primarily used to cut off the excitation light. The tube lens adjusts the divergence of the two beams. Finally, the detector captures the digital hologram. IP denotes the grey area, where the two beams can interfere with each other