Impact of Glass Composition on Visible Nonlinear Emission in Nanostructured Barium Aluminum Fluorosilicate Fibers

All-glass silicate fibers, possessing varying percentages of BaF
2
, BaO, and Al
2
O
3
, exhibit both visible defect luminescence features and strong frequency doubling. The former have spectra that maintain a Pekarian lineshape but whose intensity trends inversely to alumina content within the core.