摘要
对多路光纤激光输出光束进行合成是获得高功率、高光束质景的输出的有效方法。为了比较不同合成方案的远场效果,对聚焦发射的相干合成和非相干合成光束远场分布进行数值计算,从控制相位误差、光束抖动和阵列占空比等三方面对这两种方案的远场特性进行比较研究。计算结果表明,与非相十合成相比,相干合成能够在远场获得更高的能量集中度,但会受到光束抖动和阵列占空比的严重影响。和通常考虑的平行发射相比,聚焦发射体制对相干合成时相位误差的要求宽松了很多,相位误差均方根(RMS)为π/3时,半径为5.6 cm的圆桶内汇聚的能量仍大于完全相干合成情形下的90%。
It is an effective approach to obtain high-power laser beam output while maintaining good beam quality by combining multiple fiber lasers. The far-field intensity distribution for coherent combining and incoherent combining with conformal focusing transimitting is numerically calculated, and the effect of phase error, beam jitter, and fill factor is studied in detail to make a contrastive study of coherent and incoherent combining. It is shown that more energy will be encircled in the main-lobe by coherent combining. However, the far-field intensity distribution by coherent combining will be seriously affected by the beam jitter and fill factor of the laser array. And the tolerance on phase error has been improved by using conformal focusing transmitting scheme. For phase error with root-meansquare （RMS） value of π/3, more than 90% energy of the totally coherent combining counterpart will be contained in the target area with radius of 5.6 cm.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第2期276-280,共5页
Chinese Journal of Lasers
基金
国防科技大学研究生创新基金(B070701)资助项目
关键词
光纤光学
相干合成
非相干合成
相位误差
光束抖动
fiber optics
coherent combining
incoherent combining
phase error
beam jitter
