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Opt."],"published-print":{"date-parts":[[2026,4,1]]},"abstract":"<jats:p>We present a digital holographic microscope (DHM) for speckle-free quantitative imaging and depth sectioning. The proposed DHM employs an incoherent light source in an in-line Fizeau interferometer configuration with a tunable longitudinal separation between the interfering beams. This configuration enables recording fringes within the source\u2019s longitudinal coherence length, facilitating depth-sectioning capability and quantitative imaging. A polarization-phase shifting approach retrieves a quantitative speckle-free phase image from experimentally recorded interferograms. Experimental validation using smooth and rough objects demonstrates the system\u2019s performance, further supported by the perception-based image quality evaluator. 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