Ionizing radiation profiling through the induced refractive index change in backscattering-enhanced optical fibers

Massimo Olivero; Aurora Bellone; Martha Yamile Segura Sarminento; Wilfried Blanc; Franck Mady; Mourad Benabdesselam; Daniele Tosi; Guido Perrone

doi:10.1117/12.2624401

25 May 2022 Ionizing radiation profiling through the induced refractive index change in backscattering-enhanced optical fibers

Massimo Olivero, Aurora Bellone, Martha Yamile Segura Sarminento, Wilfried Blanc, Franck Mady, Mourad Benabdesselam, Daniele Tosi, Guido Perrone

Author Affiliations +

Proceedings Volume 12142, Fiber Lasers and Glass Photonics: Materials through Applications III; 121420W (2022) https://doi.org/10.1117/12.2624401
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Enhanced Rayleigh backscattering optical fibers, interrogated by an optical frequency domain reflectometer, are used to perform remote real-time measurements of X-ray irradiation profiles, with possible application as dosimeters in radiotherapy treatments. The enhanced Rayleigh backscattering is obtained by proper engineering of the composition of fiber core, either by introduction of Aluminum or Magnesium silicate nanoparticles as radiation-sensitive dopants. A detectable radiation-induced refractive index change can be spatially resolved through the measurement of the frequency shift of the Rayleigh backscattering along the fiber. It is experimentally demonstrated that two mechanisms of radiation-induced refractive index change take place. At doses nearly compatible with those delivered in radiotherapy, a negative refractive index is induced, whereas at high doses the change is positive. This behavior is also confirmed by the shift of Bragg wavelength of a fiber Bragg grating inscribed in the nanoparticles-doped fiber and used as a reference.

Conference Presentation

Citation Download Citation

Massimo Olivero, Aurora Bellone, Martha Yamile Segura Sarminento, Wilfried Blanc, Franck Mady, Mourad Benabdesselam, Daniele Tosi, and Guido Perrone "Ionizing radiation profiling through the induced refractive index change in backscattering-enhanced optical fibers", Proc. SPIE 12142, Fiber Lasers and Glass Photonics: Materials through Applications III, 121420W (25 May 2022); https://doi.org/10.1117/12.2624401

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