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双包层光纤涂覆层的热损伤是高功率连续光纤激光器运转的主要限制因素之一。对高功率连续光纤激光器中的热效应进行研究,并对于仅由于涂覆层的热损伤引起的功率极限给出了理论模拟。进行了千瓦级光纤激光器中无源光纤与增益光纤熔点冷却的理论与实验研究。对于不同的冷却结构分别测量光纤与热沉之间的热接触电阻,并提供了有效的散热方案实现热量的有效传导。采用新型散热技术,基于主振荡功率放大(MOPA)结构,研制出1080nm 1.11kW全光纤激光器样机。放大级抽运光注入处熔点表面最大温度为327K(54℃),运行过程中没有非线性效应和热损伤现象出现。
Thermal damage to double clad fiber coatings is one of the major limiting factors in the operation of high power continuous fiber lasers. The thermal effects in high power continuous fiber lasers are studied and a theoretical simulation is given for the power limit due to thermal damage of the coating only. The theoretical and experimental studies on the melting point of passive fiber and gain fiber in kilowatt fiber laser are carried out. The different cooling structures are respectively used to measure the thermal contact resistance between the optical fiber and the heat sink, and provide an effective heat dissipation scheme for effective heat conduction. The new cooling technology, based on the main oscillator power amplifier (MOPA) structure, developed a full-size 1080nm 1.11kW fiber laser prototype. The maximum temperature of the melting point surface of the pumping stage at the amplification stage is 327K (54 ℃). There is no non-linear effect and thermal damage during the operation.