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An Yb 3+ /Al 3+-codoped microstructured optical fibre is prepared based on photonic crystal fibre technology.The characteristic spectra of preforms and fibres are experimentally investigated.The results show that under a 971 nm excitation,besides the known infrared fluorescence luminescence around 1050 nm,a blue luminescence peak at 486 nm is obtained.Moreover,an unexpected emission peak at 730 nm is also observed.The photoluminescence mechanism of an Yb 3+ /Al 3+-codoped microstructured optical fibre is discussed.The emission peak at 486 nm is attributed to the cooperative upconversion resulting from pairs of Yb 3+ ions,and the emission peak around 730 nm is ascribed to the stimulated Raman scattering because of nonlinear effects of microstructured optical fibre.The Yb 3+ /Al 3+-codoped microstructured optical fibre is promising for varieties of applications from laser printing and optical recording to cancer treatments,such as photodynamic therapy.
An Yb 3+ / Al 3 + -codoped microstructured optical fiber is based on photonic crystal fiber technology. These characteristic spectra of preforms and fibers are experimentally investigated. The results show that under a 971 nm excitation, besides the known infrared fluorescence luminescence around 1050 nm, a blue luminescence peak at 486 nm is obtained. More than an unexpected emission peak at 730 nm is also observed. The photoluminescence mechanism of an Yb 3+ / Al 3 + -codoped microstructured optical fiber is discussed. The emission peak at 486 nm is attributed to the cooperative upconversion resulting from pairs of Yb 3+ ions, and the emission peak around 730 nm is ascribed to the stimulated Raman scattering due to nonlinear effects of microstructured optical fiber. The Yb 3+ / Al 3 + -codoped microstructured optical fiber is promising for varieties of applications from laser printing and optical recording to cancer treatments, such as photodynamic therapy.