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The lithium bismuth aluminum borate glasses doped with Er 3+  ion (LiBiAlB:Er) were investigated for laser and optical amplifier applications by the Judd–Ofelt and MacCumber theory. The LiBiAlB:Er glass with optimum Er 2 O 3  concentration, 1.0 mol%, then was selected to enhance the luminescence properties by co-doping with the Yb 3+  ion. The Er 3+ /Yb 3+  co-doped glasses (LiBiAlB:ErYb) were prepared and studied in the physical, optical, glass network, absorption, and luminescence properties. The glass density tends to increase with addition of Yb 2 O 3  concentration. The FTIR spectra perform the main glass structure which composes of the trigonal BO 3  and tetrahedral BO 4  borate groups mixing with AlO 6  complex. The improvement of absorption coefficient around 977 nm by doping with Yb 3+  results in the enhancement of Er 3+  emission intensity at 1536 nm wavelength ( 4 I 13/2  →  4 I 15/2 ). The Yb 3+ → Er 3+  energy transfer is a significant factor of luminescence development in LiBiAlB:ErYb glass. The MacCumber analysis confirms the high potential for using LiBiAlB:ErYb glass, with Er 2 O 3  1.0 mol% and Yb 2 O 3  2.0 mol%, as an infrared laser medium and a fiber optics amplifier.

The Development of Er 3+ / Yb 3+ Co-Doped Li 2 O-Bi 2 O 3 -Al 2 O 3 -B 2 O 3 Glass for Laser and Fiber Optics Applications