单词	axicon
释义	axicon noun ax·​i·​con ˈak-sə-ˌkän  plural axicons : an object resembling an optical lens with a conical surface that has no definite focal point On a trip to Russia, Milchberg discovered that scientists there were using an odd, funnel-shaped "axicon" lens that brought laser beams into an elongated, needle-like focus instead of the sharp point that conventional lenses produce. Curt Suplee, Washington Post, 11 Sept. 1995 Word History Etymology axi- + icon First Known Use 1954, in the meaning defined above
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