A Lucent Waveguide Electromagnetic wave Plasma Light Source has a fabrication 1 of fused quartz sheet and drawn tube. An inner closed void enclosure 2 is formed of 8mm outside diameter 4mm inside diameter drawn tube. Electromagnetic wave excitable plasma material is sealed inside the enclosure. The end plate 5 is circular and has the enclosure 2 sealed in a central bore in it the bore not being numbered as such. A similar plate 6 is positioned to leave a small gap between the inner end of the enclosure and itself. The two tubes are concentric with the two plates extending at right angles to their central axis. The outer tube 7 extends back from the back surface of the inner plate 6 as a skirt 9. This structure provides: an annular cavity 1 1 between the plates around the void enclosure and within outer tube; � a skirted recess 13. Accommodated in the skirted recess is a right circular cylindrical block 14 of alumina dimensioned to fit the recess with a sliding fit. An antenna 18 with a Tee/button head 19 is housed in a bore 15 and counter bore 16 in the alumina block. The quartz fabrication 1 with the alumina block 14 is accommodated in a Faraday cage 20 extending across the fabrication at the end plate 5 and back along the outer tube for the extent of the cavity 10. The cage has an imperforate skirt 22 extending 8mm further back than the quartz skirt 9.
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