Through-the-coating femtosecond laser inscription of very short fiber Bragg gratings for acoustic and high temperature sensing applications

• Published in: Optics express Vol. 25; no. 21; p. 25435
• Main Authors: Hnatovsky, Cyril, Grobnic, Dan, Mihailov, Stephen J
• Format: Journal Article
• Language: English
• Published: United States Optical Society of America 16.10.2017

Very short Type I and Type II Bragg gratings, on the order of 100 µm in length, are written through the protective polyimide coating of high NA and standard single mode silica optical fibers with infrared femtosecond pulses and a phase mask. By exploiting the transverse walk-off of apertured diffrac...