Morphology and Thermal Stability of Fiber Bragg Gratings for Sensor Applications Written in ${\rm H}_{2}$-Free and ${\rm H}_{2}$-Loaded Fibers by Femtosecond Laser
ABSTRACTDirect, point-by-point inscription of fiber Bragg gratings by infrared femtosecond laser is reported. Using this technique, highly reflective gratings can be rapidly inscribed in standard, untreated fiber. Thermal studies demonstrate increased thermal stability compared to the UV-inscribed gratings.
Photosensitivity and thermal stability of UV-induced fiber Bragg gratings in phosphate glass fibers