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Figure 23: Experimental setup. L1–3: lenses, HWP: half-wave plate, P: polarizer, PBS: polarizing beam splitter, QWP: quarter wave plate, MO1-2: microscopic objectives (0.3 NA/10× or 0.25 NA/10× or 0.1 NA/5×), RM: reference mirror, S: rectangular slit, WP: wollaston Prism, CCD: charge-coupled device.