提出并实现了一种基于扭绞保偏光纤光栅的单纵模单偏振掺铒光纤激光器。光纤激光器的线型激光谐振腔由两个均匀保偏光纤光栅构成并作为激射波长和纵模模式选择器件，均匀保偏光纤光栅采用248 nm KrF 准分子激光直接刻写在不需要氢载的自制保偏光敏掺铒光纤上。利用保偏光纤光栅引起的偏振依赖损耗效应，通过对光纤激光器谐振腔进行适当扭绞，成功实现了稳定输出的单纵模单偏振掺铒光纤激光器。

Single-polarization, single-longitudinal-mode (SLM) erbium-doped fiber laser based on the twisting of polarization-maintaining fiber Bragg gratings (PMFBGs) is proposed and demonstrated. Two uniform FBGs directly written in a homemade polarization-maintaining and photosensitive erbium-doped fiber (PMPEDF) without hydrogen loading by using ultraviolet light from a 248 nm KrF excimer laser as the wavelength-selective component are used in a linear cavity. Owing to the polarization-dependent loss enhanced by the PMFBGs, stable SLM and stable single- polarization operation of the fiber laser are achieved by controlling the birefringence through appropriately twisting the fiber laser cavity.