同带抽运高效率光纤放大器

High efficiency tandem-pumped fiber amplifier

以光纤光栅为谐振腔搭建了波长为1020nm的光纤激光器,并通过两级级联放大获得了590mW的最大输出功率.利用获得的波长为1020nm的激光进行了波长为1064nm种子光同带抽运放大,实验研究了不同增益光纤长度时放大器的输出功率和转换效率.当增益光纤长度为8.5m时,放大器最大输出功率为385mW,斜率效率为81%.进行了波长为976nm的半导体激光器直接抽运波长为1064nm种子光的实验.在增益光纤长度最优时,其斜率效率为56.4%.实验结果表明,同带抽运方式比传统抽运方式具有更高的转换效率.研究结果可为波长为1020nm的激光高功率放大和波长为1064nm的光纤激光高功率同带抽运放大提供一定的参考.

A 1020 nm fiber laser is designed based on fiber Bragg grating and then its output power is boosted to 590 mW through a two-stage amplifier.A tandem pumping fiber amplifier is constructed with the 1020 nm laser used as a pump source.The output power and the efficiency of the amplifier are measured with different lengths of gain fiber.A 385 mW maximum output power with an 81% slope-efficiency is achieved when the gain fiber is 8.5 m.The output power and the efficiency of a traditional amplifier in which 976 nm diode laser is used as a pump source are also measured.The experimental results indicate that tandem pumping fiber amplifier can achieve a higher efficiency than traditional fiber amplifier.