  We present a new digital holographic microscope (DHM) with a low coherent
source for the quantitative imaging of smooth and optically rough objects. The
experimental design of the microscope uses an in-line experimental geometry
based on the Fizeau interferometer and shows the depth sectioning capability
due to the limited longitudinal coherence of the source. A polarization-phase
shifting approach is implemented to extract the quantitative and speckle-free
image from the experimentally recorded interference fringes. To test and
experimentally demonstrate the working of the proposed DHM, we present the
results of the quantitative images for different objects.
