Abstract
Chalcohalide glass based on the composition of Ge-Ga-S-CsI(GGSI)doped with Nd3+(0.5wt.%)was synthesized with the traditional melt-quenching technique.The synthesized glass material was used to fabricate large refractive index(n≈2.1)microspheres using an improved flowing powders method.The fabricated spheres have diameters ranging from 50to 300μm.Microspheres with good surface quality were selected for the following coupling experiment.Biconical tapered fibers with waist diameters of 1~2μm were fabricated with a flame-heating process.They were then coupled with the selected GGSI glass microsphere via phase-matched evanescent waves.The phase-matching condition between the sphere and the fiber predicted high order radial modes in microsphere would be excited by the evanescent field of the fiber taper.In experiment,an 808nm Laser Diode(LD)was used as the excitation source and fluorescence emission spectra of the selected microsphere were measured.Periodically spaced intensity peaks around 1 075nm,which indicated Whispering Gallery Mode(WGM)optical resonances occurred in the Nd3+doped GGSI glass microsphere,were clearly observed in experimental results.The typical spacing between two resonance peaks is 1.80nm,which is in good accordance with the theoretical prediction.
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