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为使光纤激光器在自由空间中进行有效的相干合成,提出了耦合臂上带有会聚透镜的迈克尔逊型耦合腔,并将外腔配置为f-f结构以增强内部反馈.利用高斯光束的ABCD定律分析了外腔的传输特性,详细研究了外腔偏离f-f结构对相互注入耦合效率的影响,指出输出光纤端面与透镜前焦平面的偏差是影响反馈耦合效率的关键因素.基于此特别设计的迈克尔逊型耦合腔,实验上实现了两路光纤激光的有效相干合成.当透镜被移走时,阵列输出功率下降为原始值的78.5%,且相干态变得不稳定.
In order to make the fiber laser effectively coherently synthesized in free space, a Michelson-type coupling cavity with a condenser lens on the coupling arm is proposed and the outer cavity is configured as an ff structure to enhance the internal feedback. By using the ABCD law of Gaussian beams The effects of external ff structure on the mutual injection coupling efficiency are studied in detail. It is pointed out that the deviation of the output fiber end face from the lens front focal plane is the key factor affecting the efficiency of feedback coupling. Based on this specially designed Michelson Type coupling cavity, the coherent synthesis of two fiber lasers is experimentally realized.When the lens is removed, the output power of the array is reduced to 78.5% of the original value, and the coherent state becomes unstable.