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An excited state Voigt atomic optical filter working at optical communication wavelength (1.5 μm) is realized. The filter achieves a peak transmittance of 53.5% with a double-peak structure, in which each one has a bandwidth of 600 MHz. Different from the Faraday anomalous dispersion optical filter, the magnetic field of the Voigt filter is perpendicular to the propagation direction of the light,...
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