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Scheme of experimental setup. aom, acoustooptic modulator; be, beam expander; d, field diaphragm for laser beam (d1) and fluorescence (d2); dm, dichroic mirror (510 nm); bpf, band pass filter (500–530 nm); pmt, photo multiplier tube; ld-40x, water immersion long-distance objective with ×40 magnification (see text for details).
