We report a flat spectral Faraday anomalous dispersion optical filter (FS-FADOF) for sodium lidar. The physical and technical considerations for obtaining a FS-FADOF with a $3.5\mathrm{GHz}$ flat spectral transmission function are presented. It was found that the effective transmission of this filter was much higher ( $>94\%$ ) and more uniform than that of the ultranarrowband FADOF, and therefore were less sensitive to laser-frequency drift. Thus, the FS-FADOF can improve lidar efficiency and precision.

© 2011 Optical Society of America

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