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理论分析了利用高频CO2激光脉冲在不同类型光纤中写入长周期光纤光栅(LPFG)时光纤包层和纤芯发生折射率改变的机理和计算方法.结果表明,残余应力释放、快速固化、光纤致密化和熔融变形是高频CO2激光能成栅的主要原因,但采用不同的写入方法、不同的激光写入能量在不同的光纤类型上制作光栅时各种机理的重要性不同.利用长周期光纤光栅对构成的M-Z干涉仪实验测量了高频CO2激光以不同辐射能量在光纤不同作用位置所引起的光纤纤芯或包层的折射率平均变化量,并通过实际制作光栅的过程来初步验证光纤折射率的变化情况.CO2激光与光纤相互作用机理的分析和实验研究为利用这种方法制作折变型全光纤器件提供了实验制作的基础和完善工艺的方法.
The mechanism and calculation method of changing the refractive index of the fiber cladding and the core when the long-period fiber grating (LPFG) is written into different types of optical fibers by using high-frequency CO2 laser pulses are theoretically analyzed. The results show that the residual stress is released, Fiber densification and fusion deformation are the main reasons for the high-frequency CO2 laser to form a gate. However, using different writing methods and different laser writing energies, the importance of each mechanism is different when fabricating a grating on different fiber types. Periodic fiber grating on the MZ interferometer experiment was measured by high-frequency CO2 laser with different radiant energy at different positions of the fiber optic fiber core or cladding caused by the average refractive index change, and the actual process of making the grating to the initial Verify the change of the refractive index of the optical fiber.The analysis and experimental study of the interaction mechanism between the CO 2 laser and the optical fiber provide the basis for experimental fabrication and the method of perfecting the fabrication for making the all-optical fiber device with folded type by this method.