利用扫描相位掩模法在光敏光纤上成功写制了45°倾斜光纤光栅, 为了增加光栅的长度, 采用了在同一光纤上连续拼接写制多段倾斜光栅的技术, 提高了45°倾斜光纤光栅的偏振选择特性。对写制的45°倾斜光纤光栅的偏振依赖损耗特性进行了实验研究, 报道了利用45°倾斜光纤光栅作为偏振元件, 实现了掺铒光纤激光器的线偏振稳定输出, 输出激光的偏振消光比达到30 dB, 证明了45°倾斜光纤光栅具有良好的偏振依赖特性, 作为一种新的偏振元件, 具有光纤化、性能高、结构紧凑以及价格低廉的特点, 具有很大的发展潜力。

A 45°tilted fiber Bragg grating (TFBG) is fabricated in photosensitive fiber successfully using the scanning phase mask technique and a Ar-ion laser source. In order to increase the TFBG’s length and its polarization-dependent loss (PDL) effect, a concatenating technique is used in the fabricating process, keeping the uniform structure of the whole grating. The PDL characteristic of the TFBG is experimentally researched in the paper. Using a 45°TFBG as the polarization element, a single-polarized Er-doped fiber laser is demonstrated The polarization-extinction ratio of the output laser is about 30 dB, indicating the high PDL of the 45°TFBG. 45°TFBGs have the advantages of in-fiber, compact, good polarization capability and low price used as polarization devices.