涂覆层对高频 CO2激光刻写长周期光纤光栅的影响

摘要

The effects of coat to long-period fiber grating written by high-frequency CO2 laser pulses were studied in the pa-per.The experiment results showed that long-period fiber gratings written on coated fiber of its resonant wavelength, peak loss and additional loss not only changed smoothly, but also had a smaller average additional loss.Coats of fiber gratings could improve the gratings'mechanical characteristics, but it would need more times to writing, which may make the writing point have a tiny shift.%研究涂覆层对高频CO2脉冲激光刻写长周期光纤光栅的影响。实验表明：在带涂覆层的光纤上刻写光栅时，光栅的谐振波长、峰值损耗和附加损耗的变化更趋平缓，而且平均损耗更小；涂覆层的存在会提高光栅的机械强度，但会增加刻写次数，易造成光栅刻写位置发生微小偏移。