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增益光纤中的热效应是限制高功率光纤激光器输出功率的重要因素之一。采用基于分布式温度传感的方法对光纤激光器增益光纤的温度进行测量,有助于对光纤激光器形成保护,并有望对热致模式不稳定(MI)等非线性效应的产生机理提供一种新的认知手段。介绍了目前国内外主要的分布式光纤传感技术,重点介绍了光频域反射法(OFDR)、布里渊光时域分析(BOTDA)、布里渊光频域分析(BOFDA)和布里渊相干域分析(BOCDA)等技术在光纤温度和应力测量方面的应用。最后分析了利用各种分布式传感方案实现高功率光纤激光器温度测量的可行性,为高功率光纤激光器的温度测量提供参考。
One of the important factors that limit the output power of high-power fiber lasers is the thermal effect in the gain fiber. Measuring the temperature of the fiber gain fiber based on the distributed temperature sensing method helps to form the protection of the fiber laser and is expected to provide a new mechanism for the generation of nonlinear effects such as thermal induced mode instability (MI) Cognitive approach. The main distributed optical fiber sensing technology in China and abroad are introduced, including OFDR, BOTDA, BOFDA and Brillouin optical frequency domain analysis, The application of coherent domain analysis (BOCDA) and other technologies in optical fiber temperature and stress measurement. Finally, the feasibility of using various distributed sensing schemes to measure the temperature of high power fiber laser is analyzed, which provides a reference for the temperature measurement of high power fiber laser.