光纤激光器相干合成系统中组束误差对远场光场的影响

Influence of Combining Errors in the System for Coherent Combining of Fiber Lasers on the Far Field of Output

对光纤激光器相干合成系统中组束误差对远场光场分布的影响进行了数值研究,分析了输出单元占空比、位置误差和平行度误差对远场光场分布的影响。结果表明,输出单元占空比的增加只能提高中心光斑的能量,但无法改变中心光斑的平均光强;而位置误差会使远场光场中的旁瓣能量减弱,降低光纤激光器相干合成系统的转换效率。分析发现,位置误差的这种影响可以通过增加输出单元的占空比来减弱。最后,通过分析平行度误差对远场光场的影响,对光纤激光器相干合成系统中的平行度误差控制提出了建议。

The influence of combining errors in the system for coherent combining of fiber lasers on the far field of output is studied numerically. Influences of the duty ratio, position errors and parallel errors on the distribution of far field are researched. The results show that the increase of duty ratio of output elements will raise the energy of the central lobe rather than change the central lobe＇s average intensity; and position errors will decrease the energy of side lobes and the energy transfer efficiency of the system. It is found that the influence of position errors can be offset by increasing the output element＇s duty ratio. Finally, the influence of parallel errors on far field is discussed and relative suggestion is provided.