Abstract: Features and parameters of acousto-optic (a-o) frequency shifters and a-o Bragg cell for spectrum analyzer, developed and manufactured, are shown in this work. Three particularly interesting versions of frequency shifter have been made, using Ge single crystal with LiNbO$-3$/ transducer for $lambda equals 10.6 micrometer. They were equipped with specially electric matching circuits in order to widen and shape frequency characteristic. !16
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