National Natural Science Foundation of China [51935013, 52005521]
机构署名：
本校为其他机构
院系归属：
机电工程学院
摘要：
The fiber Bragg gratings (FBGs) are important for the fiber sensing systems. The high-quality FBGs were inscribed by picosecond laser direct writing method in single-mode fiber for the first time. The mechanism of refractive index (RI) modulation in fiber by picosecond laser was revealed by Raman spectra and the results show that the RI modulation is mainly caused by the increase of fictive temperature. Further high-temperature testing showed that the FBGs have good stability under temperature of 1130 degrees C. In addition, the XRD experimental results reveal that the probable cause of FBGs f...
