Optical Properties of LiF–Li2O –WO3–B2O3 Glasses

<p>Glass with compositions xLiF–(30−x)Li₂O –10WO₃–60B₂O₃ for 5 ≤ x ≤ 25 mol% have been prepared using the normal melt quenching technique. The optical absorption and reflection spectra were recorded at room temperature in the wavelength range 300-800 nm. From the absorption edge studies, the values of the optical band gap (E_opt) and Urbach energy (ΔE) have been evaluated. The values of E_opt and ΔE vary non-linearly with composition parameter, showing the mixed alkali effect.</p>

High Current Implantation of Negative Copper Ions into Silica Glasses

High- current implantation of Cu- ions into silica glasses has been demonstrated using mAclass negative ion beams at 60 keV. Negative ion implantation has an advantage to alleviate specimen charging for insulating substrates and has attained high dose rates, up to 260 μA/cm2. Spherical Cu colloids form in the silica glasses without additional thermal annealing. Optical absorption and reflection of the implanted specimens vary with the current density, even at a fixed dose level. A beam- induced surface plasma may affect the high current implantation.