Abstract
In conclusion, we have demonstrated an efficient tunable solid- state laser-pumped Er fibre amplifier and laser, with a slope effi- ciency of 55%. Developments in high power (>IOW) compact diode laser pumped Nd based solid state lasers as the pump source for the tunable Cfl+:YAG pump laser of the amplifier, point to power scalability and should allow saturated powers from Er3+ based fibre amplifiers > 30dBm in simple single-pump source- single fibre amplifier element geometries. These moderately effi- cient high power CF:YAG pump lasers may be attractive for remote pumping applications of Er)' based systems. Acknowledgments: The financial support of the EPSRC for this research is gratefully acknowledged. The contribution of the Royal Society is also acknowledged. Y.P. Tong and K. Rottwitt gratefully acknowledge the personal financial support of the National Science Council of Taiwan and the Danish Technical Research Council, respectively.
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