激光场相干叠加光束合成技术

摘要

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%.%光束拼接激光相干合成中，拼接占空比不高导致合成光束能量集中度不够理想，为了解决这个问题，提出了激光场相干叠加光束合成技术路线，设计了基于半反半透合束镜的多级激光场相干叠加光束合成方案。研究了子光束之间的光强差和波面误差对相干合成的影响，结果表明，激光场相干叠加光束合成中，对参与合成子光束的光强差、相位差的容差均不难满足：仅考虑单一因素时，子束光强相差三倍时合成效率仍可达90％，相位误差小于π/5时，合成效率可达到90．5％。搭建了基于半透半反合束镜的两束激光场相干叠加光束合成实验装置，实验验证了激光场相干叠加光束合成技术的可行性，在闭环情况下得到了稳定的合成光束输出，合成效率可达95％以上。