近红外飞秒脉冲激光制作光纤光栅的研究

Theory Analysis of Fiber Grating Production Using Infrared Femtosecond

根据近红外飞秒激光有大的空间相干尺寸和相位掩模衍射光的级次走离效应,运用双光束干涉原理分析了光纤纤芯处干涉光强的分布,同时运用波长800nm飞秒激光在没有经过光敏性处理的掺铥光纤上制作了光纤布拉格光栅,最后把理论分析的结果与实验现象进行了比较。

Infrared femtosecond laser has highly spatial coherence,and order walk-off will happen behind the phase mask. In this paper,the interference patterns in the core are modeled by using two beam interference theory,and fiber Bragg gratings are fabricated in the unphotosensitive Tm-doped fibers using 800 nm femtosecond radiation. In the end,the simulative results are compared with the experimental results.