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Comparative Study of γ- and e-Radiation-Induced Effects on FBGs Using Different Femtosecond Laser Inscription

Antreas Theodosiou1, Arnaldo Leal-Junior2, Carlos Marques3

  • 1Photonics and Optical Sensors Research Laboratory (PhOSLab), Cyprus University of Technology, Saripolou 33, Limassol 3036, Cyprus.

Sensors (Basel, Switzerland)
|December 28, 2021
PubMed
Summary

This study compares gamma and electron radiation effects on femtosecond laser-inscribed fibre Bragg gratings (FBGs). It identifies which inscription method yields more radiation-robust FBGs for harsh environments.

Keywords:
FBGselectron radiationfemtosecond laser inscriptiongamma radiationoptical sensorsradiation hardness

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Radiation Physics

Background:

  • Fibre Bragg gratings (FBGs) are crucial optical sensors.
  • Their performance in radiation environments is critical for applications.
  • Understanding radiation-induced changes is essential for reliability.

Purpose of the Study:

  • To comparatively study gamma and electron radiation effects on femtosecond laser-inscribed FBGs.
  • To evaluate the robustness of point-by-point versus plane-by-plane inscription methods under radiation.
  • To identify the material basis for radiation-induced spectral and thermal coefficient changes.

Main Methods:

  • Femtosecond laser inscription of FBGs in SMF28 silica fibre.
  • Exposure to 15 kGy of gamma and electron radiation.
  • Spectral analysis and Fourier Transform Infrared (FTIR) spectroscopy.

Main Results:

  • Radiation exposure altered FBG spectra and temperature coefficients.
  • FTIR identified specific chemical bonds responsible for optical and thermal changes.
  • Comparison of inscription methods indicated varying degrees of radiation robustness.

Conclusions:

  • Femtosecond laser-inscribed FBGs exhibit sensitivity to gamma and electron radiation.
  • The inscription method significantly influences FBG radiation resilience.
  • FTIR analysis provides insight into the physical mechanisms behind radiation-induced FBG degradation.