Design a tunable glasses optical filters using CuO doped fluoroborate glasses

Abstract Successfully, the glass composition (80% B2O3-15% NaF-5%CaF2) was prepared using the melt quenching technique. Different CuO ration from 0.3 wt% up to 12 wt% was added to the prepared glass composition at the expense of B2O3. The X-Ray diffraction pattern reveal the amorphous structure of the prepared glasses samples. The UV–Vis-NIR optical absorption spectrometer was used to investigate the optical properties of the glass samples. The structure was examined using the FTIR absorption spectroscopy. The optical absorption measurements reveal that the glasses sample from 0.30 wt% up to 3.60 wt% of CuO ratio produces band-pass glass filter samples. In addition, the CuO content of 6.0 wt% and higher concentrations up to 12.0 wt% give cut-off filters in the NIR region. The origin of the two types of filtering property was discussed in the frame of optical absorption and the changes in the glasses samples structure were discussed in the frame of FTIR absorption spectroscopy.