Study On Coherent Beam Combination Technology Of Fiber Lasers Based On Multi-face Prism

As a technical approach to further scale the output brightness,coherent beam combination(CBC)has become a hot research topic at home and abroad in recent years.However,the output power of the CBC is also limited by the unit power and the number of combining channels.Therefore,increasing the unit output power or the number of combining channels is an effective way to scale the brightness of the CBC.In this paper,we select coherent beam combination technology of fiber lasers based on multi-face prism as the research object to perform systematically theoretical and experimental study for further scaling the unit power in the CBC.1.By comprehensively considering the development status and deeply analyzing the limited factors of high-brightness fiber laser and coherent beam combination,a coherent fiber-optics-array collimator based on multi-face prism is proposed.2.A theoretical model of CBC based on multi-face prism is established based on the principle of the wave optics.The error analysis of the system and coherent combining effect of different numbers of single collimators and the number of large number of elements are simulated.3.Experimental research on fiber laser CBC based on multi-face prism is carried out.The experimental results were analyzed in detail,and the feasibility of the scheme was verified experimentally.4.The beam number expansion design and system performance optimization of the fiber laser coherent combining system based on multi-face prism are performed.Theoretically,the number of larger beams of collimating and coherent combining in a single collimator is explored,and the influence of the intensity distribution of the unit beam in the CBC is analyzed.Finally,the specific design scheme of beam shaping is obtained by SPGD algorithm.