基于非对称全息干涉的倾斜光纤光栅研究

摘要

In order to overcome the limitation of the existed fabrication techniques of titled fiber Bragg grating (TFBG), a novel method utilizing the asymmetrical holographic interference technique is put forward in this paper. We add a cylindrical lens in the holography light path to focus the circular laser beam into linear shape, and the beam parallel to the material layer, then we can get tilted fiber reflective grating with various angles and flexible fringe spacing.Though controlling the exposure conditions, the reflectivity and bandwidth of the TFBG can be controlled precisely. The simulation and analysis showed that this method has the referential meaning and practical value for fabricating titled fiber Bragg grating.%为了突破现存的倾斜布拉格光纤光栅制作方法的局限,提出了采用非对称光路制作倾斜条纹反射式光纤光栅的方法.该方法是通过在全息光路中加入柱面镜,将圆形光斑聚焦成线状激光,线状激光以平行于材料层的方式写入,从而获得不同倾斜角度,条纹间距任意的倾斜光纤光栅.通过写入条件的控制,达到精确控制光栅的反射率和带宽的目的.模拟仿真和分析表明这种方法对实际制作倾斜光纤光栅具有一定的参考意义和实用价值.