The optimization of the fiber geometry, core composition & rare earth ion concentration in optical fibers are of great importance in obtaining high photoluminescence quantum yield (PLQY) for optical refrigeration applications. Presented herein are the important advancements in the development of a Y2O3: Yb (5 molars percent) nanoparticle doped fibers embedded in glass matrix with composition 95SiO2-5GeO2, with an in-depth investigation on structural and optical properties for laser cooling applications. The impurity absorption was minimized by using high-purity precursors to fabricate the fiber using modified chemical vapor deposition method (MCVD). Structural characterizations have evidenced the presence of Y2O3 nanoparticles ranging from 25 to 50 nm. The optical properties such as transmission, refractive index, photoluminescence (PL) emission and lifetime were studied in detail. Finally, the background absorption as well as temperature change of the fibers using 1030 nm laser are measured using fiber Bragg grating (FBG) sensor.
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