Abstract
Intense greenish–yellow emission near the hemoglobin absorption peak at 577nm was observed in Dy3+ doped sodium–magnesium–aluminum–phosphate (NMAP) glasses under UV excitation. The Judd–Ofelt intensity parameters and the integrated fluorescence intensity ratio between 4F9/2→6H13/2 (yellow) and 4F9/2→6H15/2 (blue) imply a strong asymmetrical and covalent environment around Dy3+ in the phosphate glasses. The fluorescence branching ratio and the stimulated emission cross-section of the 4F9/2→6H13/2 transition were identified to be 65.9% and 25.65×10−22cm2, respectively, confirming the efficiency of the visible fluorescence emission. Channel waveguide was fabricated successfully by K+–Na+ ion-exchange method with mode field diameter of 20.5μm in the horizontal direction and 8.7μm in the vertical direction. The results demonstrate that Dy3+ doped NMAP glasses are promising to develop waveguide light sources for thrombolysis.
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