Ma Pengfei, Zhou Pu, Ma Yanxing, Su Rongtao, Liu Zejin
College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.
Appl Opt. 2012 Jun 1;51(16):3546-51. doi: 10.1364/AO.51.003546.
In this paper, the influence of aberrations on coherent polarization beam combining (CPBC) of fiber laser beams is analyzed in detail for the first time to our knowledge. The expression of the coherently polarization combined output power is obtained, which contains the geometry and nongeometry factors of the CPBC system. The geometry and nongeometry aberrations are numerically studied to investigate their effects on the combining efficiency. It is found that to ensure the combining efficiency of a CPBC unit (we studied) to be more than 90%, the overlap error (the beams in the polarization beam combiner cannot be superposed entirely) should be controlled to be less than 0.45, the tilt error should be less than 2π/15 rad, and the RMS value of the phase error should be limited to be within λ/10. The generalized methodology that we present offers a good reference for investigating the CPBC system in an extensive way.
据我们所知，本文首次详细分析了像差对光纤激光束相干偏振合束（CPBC）的影响。得到了相干偏振合束输出功率的表达式，该表达式包含了CPBC系统的几何和非几何因素。通过数值研究几何和非几何像差，以研究它们对合束效率的影响。研究发现，为确保（我们所研究的）一个CPBC单元的合束效率大于90%，重叠误差（偏振合束器中的光束不能完全重叠）应控制在小于0.45，倾斜误差应小于2π/15 rad，相位误差的均方根值应限制在λ/10以内。我们提出的通用方法为广泛研究CPBC系统提供了很好的参考。
