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A novel, compact, and broadband optical phase contrast microscopy based on incoherent vortex topological quadrupole is theoretically proposed and experimentally realized. The topological quadrupole, generated in a thin uniaxial crystal, possesses four single‐charge optical vortexes, each of which can act as a two‐dimensional (2D) optical spatial differentiator. The incoherence of light‐emitting diode...
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