OPTICAL-SPECTRA OF PB IMPLANTED FUSED-SILICA

The extinction coefficient over the spectral range of 1.8-6.2 eV and the infrared reflectance over the 5000 cm-1 to 75 cm-1 range were measured for a series of Pb ion-implanted high-purity silica substrates. The samples were implanted at room temperature with an energy of 320 keV for nominal doses of 1, 3 and 6x10(16) ions/cm2 . A sample implanted with a nominal dose of 6x10(16) ions/cm2 was annealed in air at 800-degrees-C for 1 h. The Pb ions form both elemental Pb and Pb-O particles in the as-implanted state. The extent of formation for each chemical state is dose-dependent. Upon annealing, the elemental Pb and Pb-O particles form a lead silicate phase in the implanted layer that is similar to conventionally prepared bulk lead silicate glasses.