© The Institution of Electrical Engineers
Long delay lines can be built by folding and guiding an s.a.w. beam over the surface of a smooth polished thin disc. Surface rays can recirculate on closed surfaces. The thermal characteristics of three recirculating loops on a 76.2 mm-diameter y-cut quartz disc are examined. Disc delay lines on quartz offer the advantage of temperature-stable operation.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19750028
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