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复合腔法光纤激光器谐振腔结构灵活,可以根据需要构成各种结构实现纵模选择。但稳定性差是制约其应用的主要原因,为提高光纤激光器纵模选择的稳定性及抗干扰能力,在复合腔基础上提出“共腔结构”光纤激光器这一概念。分别采用传输矩阵和自由光谱范围(FSR)两种方法详细分析了“共腔结构”光纤激光器的特性,理论分析证明:共腔结构可有效增大FSR,有利于实现纵模选择和提高抗干扰能力。实验中采用保偏光纤搭建了“共腔结构”光纤激光器方案,通过调整保偏光纤长度得到了单波长和多波长激光。实验验证了上述理论,光纤激光器FSR随保偏光纤长度变化,证明共腔法是一种很好的纵模选择技术。
Complex cavity fiber laser resonator structure flexible, according to the need to form a variety of structures to achieve longitudinal mode selection. However, poor stability is the main reason that restricts its application. In order to improve the stability and anti-interference ability of longitudinal mode selection of fiber laser, the concept of “common cavity structure” fiber laser is proposed on the basis of composite cavity. The characteristics of “common cavity structure ” fiber laser are analyzed in detail by using transmission matrix and free spectral range (FSR) respectively. The theoretical analysis proves that the common cavity structure can effectively increase FSR, which is beneficial to the selection and enhancement of longitudinal mode Anti-interference ability. In the experiment, a polarization-maintaining fiber was used to build a “co-cavity structure” fiber laser solution. Single-wavelength and multi-wavelength lasers were obtained by adjusting the length of the polarization maintaining fiber. Experiments show that the FSR of the fiber laser varies with the length of the polarization maintaining fiber. It is proved that the common cavity method is a good longitudinal mode selection technique.