Optical analysis of RE³⁺ (RE = Nd or Er):B₂ O₃ -P₂ O₅ -CaF₂ -ZnO-(Li₂ O/Na₂ O/K₂ O) glasses

Calcium boro fluoro zinc phosphate glasses modified using alkali oxide and doped with Nd³⁺ and Er³⁺ ions with the chemical composition of 69.5 (B₂ O₃ ) + 10 (P₂ O₅ ) + 10 (CaF₂ ) + 5 (ZnO) + 5 (Na₂ O/Li₂ O/K₂ O) + 0.5 (Er₂ O₃ /Nd₂ O₃ ) were prepared using a conventional melt quenching technique. The results of X-ray diffraction patterns indicated the amorphous nature of all the prepared glasses. The visible-near-infrared red (NIR) absorption spectra of these glasses were analyzed systematically. The NIR emission spectra of Er³⁺ and Nd³⁺ :calcium boro fluoro zinc phosphate glasses showed prominent emission bands at 1536 nm (⁴ I_13/2 →⁴ I_15/2 ) and 1069 nm (⁴ F_3/2 →⁴ I_11/2 ) respectively with λ_exci  = 514.5 nm (Ar⁺ laser) as the excitation source.