CO2激光加热硅芯光纤预制棒的温场分布

研究了10.6 m CO2激光加热硅芯光纤预制棒的温场分布，在考虑预制棒表面热辐射和空气对流的情况下，用有限元软件COMSOL Multiphysics建立了激光加热预制棒的传热物理模型，比较了激光功率、激光光斑半径和预制棒直径对温场分布的影响，同时提出CO2激光加热与石墨炉加热结合调节温场分布的方法。仿真结果显示，激光参数和预制棒直径都会明显影响预制棒温场分布，且激光光斑半径3 mm，功率达到400 W的激光器可用于直径10 mm内的硅芯光纤预制棒制备硅芯光纤。通过CO2激光加热和石墨炉加热相结合的加热方式，能更加灵活有效地调节预制棒的温场分布，构建适合硅芯光纤拉丝的温场条件。

Temperature distribution of preform in drawing silicon core optical fiber with CO2 laser heating

This paper presents a physical model about the temperature distribution of a silicon preform exposed to a 10.6 m CO2 laser in consideration of air convection and environmental radiation heat transfer. In the meantime, an approach of heating the preform by the laser combining with graphite furnace is suggested. Simulation results show that the temperature distribution is strongly dependent on the parameters of the CO2 laser and the preform, and laser heating is appropriate for preform with diameter less than 10 mm when the laser spot radius is 3 mm and laser power is 400 W. Heating combining with graphite furnace can modulate the temperature gradient effectively and build the correct temperature field for silicon core fiber drawing.