【摘 要】
：
In this work,a heavily Er-doped fiber with an 8 μm core diameter and a numerical aperture of 0.13 was prepared by the modified chemical vapor deposition[MCVD]technique combined with the sol-gel method.The background loss and absorp-tion coefficient at 153
【机 构】
：
School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Key Laboratory
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In this work,a heavily Er-doped fiber with an 8 μm core diameter and a numerical aperture of 0.13 was prepared by the modified chemical vapor deposition[MCVD]technique combined with the sol-gel method.The background loss and absorp-tion coefficient at 1530 nm were measured to be 20 dB/km and 128 dB/m,respectively.Thanks to the sol-gel method,the fiber showed a good doping homogeneity,which was confirmed through unsaturable absorption measurement.The net gains of three 25,45,and 75-cm-long fibers were measured in the range of 1520 to 1600 nm,and the highest gain reached above 23 dB at both 1530 and 1560 nm in 25 and 75-cm-long fibers,respectively.The short-cavity laser performance was measured using centimeter-scale fibers.The maximum output power of 12 mW was demonstrated in a 6.5-cm-long active fiber with a slope efficiency of 20.4％.Overall,the prepared heavily Er-doped silica fiber is a promising item to be applied in a high-repetition-rate or single-frequency fiber laser.
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