Various metal ions were implanted to colorless synthetic quartz to doses of metal ions from 4×10
16 to 5×10
17 ions/cm
2 with an energy of 20 KeV. The part of quartz implanted with Cu
+ ions showed tint of light purple-red, while parts implanted with Fe
+ ions or Nb
+ ions showed yellowish brown or light blue, respectively, after annealing for 3 hours in air at 1000°C. Transparencies of the implanted sample in the visible range and the depth profile of Cu were measured.
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