激光热处理对硅锗芯石英包层光纤成分分布的影响

Effects of Laser Thermal Processing on Composition Distribution of SiGe Core Silica Cladding Fiber

硅锗合金在非平衡条件下凝固时容易出现成分偏析,光纤制备过程带来的成分分布不均匀问题会导致很高的光纤损耗。利用CO_(2)激光对半圆柱硅棒和锗棒拼接法制备的硅锗芯石英包层光纤进行热处理,研究不同处理条件对纤芯成分分布的影响。实验结果表明,在激光扫描方向上的边缘区域可形成连续的富硅硅锗合金,并且越靠近该边缘区域,纤芯的成分分布越均匀。本研究为制备和优化硅锗芯光纤,实现纤芯均匀的成分分布提供了方法。

Composition segregation can easily occur during the non-equilibrium solidification of SiGe alloys.The non-uniform composition distribution caused by the fiber fabrication process leads to high fiber loss.In this paper,the thermal processing of the SiGe core silica cladding fiber prepared by the assembly of semi-cylindrical Si and Ge rods is conducted using a CO 2 laser,and the effects of different thermal processing conditions on the fiber core composition distribution are studied.The experimental results show that continuous Si-rich SiGe alloys can form at edge of laser scanning area along the laser scanning direction,and the closer to the edge,the more uniform the composition distribution of the fiber core is.This study provides a method to fabricate and optimize a SiGe core fiber to achieve uniform composition distribution of the fiber core.