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(a) Schematic generation of the DM-FRS signal from the Zeeman-split dispersion line using a two-stage modulation/demodulation process. A process of a conventional AC-FRS signal generation is shown for comparison. (b) Frequency spectra of the AC-, DC-, and DM-FRS signals (DC- and DM-FRS demodulation is assumed to be performed at the first harmonic of f1).
