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Er3+/Yb3+-codoped phosphate glass for short-length high-gain fiber lasers and amplifiers

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Abstract

Er3+/Yb3+-codoped phosphate glass with compositions of (78.2x)P2O514Al2O35Li2O1K2O1.8Yb2O3xEr2O3 (x=0.2,0.4,0.6) in mol. % were investigated. Judd–Ofelt (JO) intensity parameters have been calculated to predict radiative properties based on absorption spectra. The stimulated emission cross section (σe) calculated according to McCumber theory was 1.50×1020cm2, almost twice larger than values reported before. The effective line width (Δeff), full width at half-maximum (FWHM) and the quality parameters for designing optical amplifier devices were listed in the table compared with other types of phosphate glass matrices. A theoretical model of a Er3+/Yb3+-codoped system based on rate and power propagation equations was put forward to investigate the potential advantages of the materials applied for short-length, high-gain fiber amplifiers. A simulated gain of 32.2 and 2.6dB/cm per unit length was achieved in 12.5-cm-long fiber.

© 2015 Optical Society of America

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