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Spectral hole-burning (SHB) technology is considered for .10-GHz instantaneous bandwidth signal-processing applications. In this context we report on what is believed to be the first demonstration of a SHB microwave spectrometer. A set of gratings engraved in a SHB crystal is used to filter one sideband of the optically carried microwave signal. The setup is confined to narrow-bandwidth operation, over a 35-MHz-wide interval. The first findings confirm the validity of the architecture in termsdoi:10.1364/ol.26.001245 pmid:18049574 fatcat:edqurempbnhy7it6sjdvc4hscm