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研究了基于结构性改变的光子晶体光纤光栅的热激法制备工艺,理论分析了此种工艺的成栅原理,采用热传导理论和有限元法研究了制备过程中光子晶体光纤中的温度场分布,以及包层空气孔结构和激光参数对成栅效果的影响.研究结果表明,利用光子晶体光纤包层空气孔周期性塌缩可以形成光栅;采用两点热激法时,能够实现能量在光纤径向均匀分布,轴向近似于高斯分布;包层气孔结构加速了成栅过程,相同光斑尺寸下,光纤塌缩所需激光功率随气孔层数和气孔半径的增大而减小;最后,对包层空气孔结构为1层到7层的光子晶体光纤热激过程进行仿真,得到了空气填充率与所需激光功率的关系.此种光纤光栅从根本上克服了传统光栅热稳定性和长期稳定性不佳的问题,在光纤传感等领域具有较大的潜在应用价值.
The preparation process of photonic crystal fiber grating based on structural change was studied by heat shock method. The principle of forming gate was theoretically analyzed. The temperature field distribution in photonic crystal fiber during the preparation process was studied by using heat conduction theory and finite element method. As well as the influence of cladding air hole structure and laser parameters on the grating effect.The results show that the grating can be formed by periodically collapsing the air holes of the photonic crystal fiber cladding layer and the energy can be realized in the fiber diameter And the axial stochastic distribution is similar to Gaussian distribution. The stomatal structure accelerates the grating forming process. With the same spot size, the laser power required for optical fiber collapse decreases with the number of stomata and stomatal radius. Finally, The air hole structure of the cladding layer is simulated by the thermal shock process of the photonic crystal fiber of layer 1 to layer 7. The relationship between the filling rate of air and the required laser power is obtained.The fiber grating fundamentally overcomes the thermal stability and long- The problem of poor stability has great potential application value in the fields of optical fiber sensing and the like.