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为了获得高功率、高光束质量相干光纤激光输出,设计了一种双端输出的光纤激光器。两路光纤激光器尾端通过反射率为85%的光纤布拉格光栅连接,有一定的相互关联,利用角锥反射器使其能量相互注入,实现锁相,并利用偏振片分光,实现相干合成输出。实验上,在远场得到了清晰稳定的干涉条纹(可见度约为0.92),获得了8.6 W的相干合成激光输出,对应的功率合成效率约为90%。实验结果表明,该方案结构简单,稳定性好,相干度高,并可用于多路激光相干合成,为实现高功率光纤激光相干合成输出提供了一种新的思路。
In order to obtain high power, high beam quality coherent fiber laser output, a double-ended output fiber laser was designed. The two fiber lasers are connected by a fiber Bragg grating whose reflectivity is 85%, and are related to each other. The pyramidal reflector is used to inject energy into each other to achieve phase locking. The polarizer is used to separate the light and achieve the coherent composite output. Experimentally, clear and stable interference fringes are obtained in the far field (the visibility is about 0.92), and a coherent synthetic laser output of 8.6 W is obtained, corresponding to a power synthesis efficiency of about 90%. Experimental results show that the proposed scheme has the advantages of simple structure, good stability and high coherence, and can be used for multi-channel laser coherent synthesis. It provides a new idea for high-power fiber laser coherent output.