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对基于环形腔光反馈的光纤激光被动锁相技术进行了理论和实验研究。建立了一维三路光纤激光阵列的相干组束实验装置,实现了三束光纤激光的相位锁定,观测到稳定的干涉图样。研究了光束占空比对远场光斑的影响,分析了影响腔内损耗的主要因素。观测到相干耦合输出光谱中所存在的多波长峰值随机出现的现象,通过采用窄带宽滤光片,可以限制相干耦合输出的光谱范围,但上述现象仍然存在。从理论上对被动锁相技术中所存在的这种波长随机现象进行了分析和解释。
Theoretical and experimental studies on passive phase-locked fiber laser technology based on annular cavity optical feedback are carried out. A coherent group beam experiment device of one-dimensional three-way fiber laser array was established to realize the phase locking of the three-fiber laser and the stable interference pattern was observed. The influence of beam duty cycle on the far-field flare was studied, and the main factors affecting the cavity loss were analyzed. The observed phenomenon of multiwavelength peaks appearing in the coherently coupled output spectrum occurs stochastically. By using a narrow bandwidth filter, the spectral range of the coherently coupled output can be limited, but the above phenomenon still exists. This paper analyzes and explains this wavelength random phenomenon existing in passive phase-locked technology theoretically.