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Figure 6: Experimental setup (lateral view); 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 0.2 5 NA/10× or 0.1 NA/5×), RM: reference mirror, S: rectangular slit, NPBS: nonpolarizing beam splitter, M1–3: mirrors, CGP: compensation glass plate, WP: wollaston Prism, and CCD: charge-coupled device.