后腔镜对掺镱双包层光纤激光器输出特性影响研究

使用国产掺镱双包层光纤搭建了双包层激光器实验系统.将透射率不同的反射镜作为后腔镜进行了激光器输出激光光谱和功率测量.根据激光器数学模型和增益理论,分析了实验中后腔镜参量对激光器输出特性的影响,并深入讨论了后腔镜透射率与激光器输出波长之间的关系.实验表明：后腔镜与激光器输出激光功率和波长紧密联系,通过调节后腔镜的透射率可以优化系统的输出激光特性.

Effect of Back-cavity Mirror on Output Characteristics of Yb3+-Doped Double-clad Fiber Laser

The Yb3+-Doped Double-Clad Fiber Laser was constructed by using Yb3+-Doped Double-Clad Fiber made in China and a set of back-cavity mirrors with different reflectivity ratios. The output power and spectrum were measured . The effect of back-cavity mirror on the output characteristics of the laser had been studied theoretically and experimentally. The relationship of the reflectivity ratio of the back-cavity mirror and the wavelength of the output laser beam had been discussed deeply. It is found that the output characteristics of the fiber laser can be better by designing the reflectivity ratio of the back-cavity mirror.