摘要
采用多抖动相位控制方法实现了两路和三路1 W量级光纤放大器的相干合成,对实验结果进行了详细分析。实验中,将种子光源输出激光分为两路(或三路),分别通过光纤放大器进行功率放大,并采用多抖动法实现相干合成。控制系统开环时,远场光斑条纹模糊不清,两路和三路合成时条纹对比度分别为0.19和0.12;系统闭环时,远场光斑条纹清晰可见,对比度提高到0.93和0.81,合成效率分别为80%和77%。此外,对两路和三路的合成效果进行了比较,指出了各路的控制资源对合成效果的影响。
Coherent beam combining of two and three watt-level fiber amplifiers is demonstrated with multi-dithering technique used for phase control. In the experiment, the master laser is split into two or three channels and the power of each channel is amplified by a fiber amplifier. When the control loop is open, the far field pattern is dynamic and blurred, and the fringe contrasts for combining are O. 19 for two beams and O. 12 for three beams. When the control loop is closed, the far-field pattern is stable and clear, the fringe contrasts for two and three beam combinings are improved to 0. 93 and 0. 81 respectively and the corresponding coherent combining efficiencies are 80% and 77%. In addition, the experimental results of two and three-beam combinings are compared and the effect of each control on coherent beam combining is given.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2009年第11期1639-1644,共6页
High Power Laser and Particle Beams
关键词
光纤激光
相干合成
多抖动法
相位锁定
fiber laser
coherent beam combining
multi dithering technique
phase-locking
