摘要
在高功率光纤激光器中,增益光纤的热效应是限制激光功率提高的重要因素之一。传统的温度测量方法只能测量到增益光纤的表面温度,无法得到增益光纤内部不同位置的温度。采用分布式光频域反射(OFDR)技术测量全光纤放大器中增益光纤纤芯的温度。对采用OFDR技术得到的温度测量结果进行了标定,验证了OFDR测量工作状态下放大器内增益光纤温度的准确性。测量了输出功率为6 W的全光纤放大器内增益光纤纤芯的温度分布,测量结果与理论相吻合。这种测温方法为未来高功率光纤激光器的温度监测提供参考。
Thermal effect of the gain fiber is one of the main factors limiting the power improvement of high power fiber amplifiers. Using traditional temperature measurement methods, we can only obtain the surface temperature of fiber while the core temperature cannot be detected. In this paper, the temperature of the gain fiber core in an all- fiber amplifier is measured by optical frequency domain reflectometry （OFDR）. Firstly, the temperature measurement results by OFDR are calibrated and the measuring accuracy of the gain fiber temperature is verified when the amplifier is in operation. Then, the temperature distribution of the gain fiber core in the all-fiber amplifier is measured when the output power is 6 W and the results agree with the current theoretical results. The temperature measurement method proposed can provide a reference for the temperature monitoring in high power fiber lasers in the future.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2017年第2期157-162,共6页
Chinese Journal of Lasers
基金
国家自然科学基金(61505260
61605245)
科技部重点研发计划(2016YFB0402200)
关键词
激光光学
光纤激光器
光频域反射法
温度测量
非线性效应
laser optics
fiber lasers
optical frequency domain reflectometry
temperature measurement
nonlinear effect
