  We propose and experimentally demonstrate temporally low-coherent optical
diffraction tomography (ODT) based on angle-scanning Mach-Zehnder
interferometry. Using a digital micromirror device based on diffractive
tilting, we successfully maintain full-field interference of incoherent light
during every scan sequence. The ODT reconstruction principles for temporally
incoherent illuminations are thoroughly reviewed and developed. Several
limitations of incoherent illumination are also discussed, such as the
nondispersive assumption, optical sectioning capacity, and illumination angle
limitation. Using the proposed setup and reconstruction algorithms, we
successfully demonstrate low-coherent ODT imaging of microspheres, human red
blood cells, and eukaryotic cells.
