摘要
研制了高功率窄线宽光纤放大器。该放大器采用双级放大结构,其中第一级预放为掺Er3+光纤放大器,第二级功率放大采用10 m长的Er3+/Yb3+共掺双包层光纤作为增益介质,抽运源采用两支波长为980 nm的大功率激光二极管。当抽运功率为10.7 W时,得到放大激光输出功率为1.94 W,光一光转换效率为17%,斜率效率20%。采用延迟自外差方法对种子激光器及各级放大器输出的激光线宽进行了测量,测量结果表明窄线宽激光谱线经过掺Er3+光纤与双包层光纤放大后均有不同程度的明显展宽。分析认为激光线宽展宽的主要原因是由于种子激光器中弛豫振荡或自脉冲的强度波动引起的自相位调制。
A two-stage high power narrow linewidth fiber amplifier was demonstrated. The first stage was single mode Er^3＋ doped fiber amplifier. The double clad Er^3＋/Yb^3＋ co-doped fiber amplifier was designed as power amplifer in which two 980 nm high power laser diodes were used as the pump sources. With the maximum pump power of 10.7 W, the amplifer output powers was 1.94 W and the optical-optical conversion efficiency was 20%, the slope efficiency was 17%. The 3 dB linewidth of seed laser and each amplifier were measured by the delayed selfheterodyne method with 10 km single mode fiber. The results show that obvious spectral broadening happenes during the amplification process. The reason of spectral broadening is owing to self-phase modulation caused by intensity fluctuations of relaxation oscillations or self-pulsing.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第7期1866-1869,共4页
Chinese Journal of Lasers
关键词
激光技术
双包层光纤放大器
窄线宽
延迟自外差方法
laser technique
double clad fiber amplifier
narrow linewidth
delayed self-heterodyne method
