Technology of filled-aperture coherent beam combining

作者：Li Bin; Ye Yidong; Yan Hong; Tian Fei; Chen Li; Luo Jia; Ma Libin

来源：强激光与粒子束, 2014, (10).

DOI：10.11884/HPLPB201426.101023

• laser field beam coherent superposing
• beam combining
• coherent beam combining
• stochastic parallel gra-dient descent (SPGD)algorithm

In the tiled-aperture coherent beam combining,the low filling factor will reduce the beam combining efficiency. To solve this problem,we proposed a filled-aperture coherent beam combining scheme based on the semi-transparent mirror. We studied the influences of the light intensity difference and wave-front phase error on the efficiency of the beam combination. The results show that it is not difficult to meet the tolerance requirement of light intensity difference and the wave-front phase er-ror requirement in the filled-aperture coherent beam combining.When considering the single factor,if the single beam's intensity is three times larger than the others',the efficiency of the combining can reach 90%.And if the phase error is less than π/5,the efficiency of the combining can reach 90.5%.We designed an experimental instrument to verify the feasibility of the filled-aper-ture coherent beam combining scheme.Experimental results show that,in the phase locked loop system,the output light intensi-ty is very stable,and the efficiency of the combining can be more than 95%.

• 单位
  中国工程物理研究院; 北京