Quantitative phase noise in two color low coherence digital holographic microscope

Short coherence digital holographic microscopy eliminates the problem of parasitic interferences resulting from long coherence length, but reduces the field of view in off-axis DHM [1]. The reason is that slight angle between reference and object beams, restricts the overlap area of two beams on the camera. We have recently introduced [2], a method based on a volume diffractive element (VDOE) to correct the coherence plane tilt in off-axis DHM. The VDOE consists of two phase gratings recorded on a photopolymer (BAYFOL® HX) from Bayer MaterialScience AG, each laminated on one side of a wedge prism. The VDOE is placed in the reference arm of an off-axis DHM to introduce a small tilt γ in the coherence plane of the reference without any effect on the propagation direction. An image of the device is shown in Fig. 1.