Device and method for preparing fluorine-based glass optical fiber preform cladding hollow tube

The invention relates to a device and a method for preparing a fluorine-based glass optical fiber preform cladding hollow tube. In the device, gas pressure is reduced in a closed crucible environment, and a constant rotation rate is supplemented, so that gas dissolved in molten glass can be effectively removed, and the fluorine-based glass preform cladding hollow tube which is free of bubbles, high in uniformity and high in interface quality is automatically/semi-automatically prepared. The method is short in preparation period and is expected to be applied to preparation of the fluorine-based optical fiber preform with a high-quality core cladding structure. 一种氟基玻璃光纤预制棒包层空心管的制备装置及方法。在该装置中，通过在封闭的坩埚环境中降低气压，并辅以恒定的旋转速率，可以有效排除玻璃液中溶解的气体，实现自动/半自动制备无气泡、高均匀度、高界面质量的氟基玻璃预制棒包层空心管。此方法制备周期短，有望应用于高质量芯包结构的氟基光纤预制棒的制备。