Characterization of fiber optics with femtosecond-infrared fiber Bragg gratings for extreme applications (Conference Presentation)

Daniel Murphy; Peter Riley; Thomas Rugari; Gary Pickrell; Brian Risch; Stephen Rountree; Matthew Davis

doi:10.1117/12.2507001

4 March 2019 Characterization of fiber optics with femtosecond-infrared fiber Bragg gratings for extreme applications (Conference Presentation)

Daniel Murphy, Peter Riley, Thomas Rugari, Gary Pickrell, Brian Risch, Stephen Rountree, Matthew Davis

Author Affiliations +

Proceedings Volume 10925, Photonic Instrumentation Engineering VI; 109250C (2019) https://doi.org/10.1117/12.2507001
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

In the nuclear industry, there is a need for sensors that are resistant to both high temperatures and radiation. Fiber Bragg gratings inscribed into radiation resistant fibers are a potential solution to this as the femtosecond-infrared laser can inscribe Bragg gratings into fibers without a photosensitive core. In order for these gratings to be used for sensing, they need to be characterized to determine their temperature and radiation response and sensitivity. This paper characterized three commercially available fibers for use in high heat and high radiation environments. There are six fiber variants examined in this study. Three basic fiber designs are investigated: a germanium doped core, a germanium doped core with fluorine cladding, and a fluorine doped core and cladding. For each fiber design, normal and pre-irradiated versions are investigated. The fibers were tested for thermal response by heating them to 1000C and holding for 24 hours, and for radiation resistance by irradiating with gamma radiation. The germanium core doped fibers were more resistant to thermal effects but still had a wavelength shift during the 24-hour soak. The fluorine-doped fibers either had the gratings partially or completely erased during the thermal hold at 1000°C, but showed suitability for short term excursions to this temperature. The radiation data showed significant shifts in some cases, but there was not enough data to form a definitive conclusion. It appears that radiation introduces variability in the response of the Fiber Bragg Gratings (FBG).

Conference Presentation

Citation Download Citation

Daniel Murphy, Peter Riley, Thomas Rugari, Gary Pickrell, Brian Risch, Stephen Rountree, and Matthew Davis "Characterization of fiber optics with femtosecond-infrared fiber Bragg gratings for extreme applications (Conference Presentation)", Proc. SPIE 10925, Photonic Instrumentation Engineering VI, 109250C (4 March 2019); https://doi.org/10.1117/12.2507001

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