Highly sensitive type IA fiber Bragg gratings as sensors in radiation environments
Date Issued
October 15, 2012
DOI
10.1117/12.975186
Abstract
Type IA fiber gratings have unusual physical properties compared with other grating types. We compare with performance characteristics of Type IA and Type I Bragg gratings exposed to the effects of Co60 gamma-irradiation. A Bragg peak shift of 190 pm was observed for Type IA gratings written in Fibercore PS-1250/1500 photosensitive fiber at a radiation dose of 116 kGy. This is the largest wavelength shift recorded to date under radiation exposure. The Type IA and Type I gratings show different kinetics under radiation and during post-radiation annealing, this can be exploited for the design of a grating based dosimetry system.