Gamma-radiation effects in pure-silica-core photonic crystal fiber

Abstract

We investigated the steady state gamma-ray radiation response of pure-silica-core photonic crystal fibers (PSC-PCFs) under an accumulated dose of 500 Gy and a dose rate of 2.38 Gy/min. The radiation-induced attenuation (RIA) spectra in the near-infrared region from 800 nm to 1700 nm were obtained. We find that the RIA at 1550 nm is related with hydroxyl (OH − ) absorption defects in addition to the identified self-trapped hole (STH) defects. Moreover, it is proposed and demonstrated that reduced OH − absorption defects can decrease the RIA at 1550 nm. The RIA at 1550 nm has effectively declined from 27.7 dB/km to 3.0 dB/km through fabrication improvement. Preliminary explanations based on the unique fabrication processes were given to interpret the RIA characteristics of PSC-PCFs. The results show that the PSC-PCFs, which offer great advantages over conventional fibers, are promising and applicable to fiber sensors in harsh environments.

A doped-polymer based porous silicon photonic crystal sensor for the detection of gamma-ray radiation

“…On the experimental side, gamma-ray radiation affects the materials and the dimensions of our structure. 48,49 The principal materials in our dosimeter are the doped polymer and the porous silicon layer. It is important to note that at an irradiation dose of 1000 kGy, the change in the Si refractive index is less than (5 × 10 −5 ).…”

“…In particular, the exposure of the designed structure with a dose of 66.5 kGy could raise its temperature 3.2 °C over the room temperature. 49 However, this increase is not effective on the thicknesses of the constituent materials due to their very small thermal expansion coefficients. As a result, the expanding in the thicknesses of these materials is not exceeding 10 −5 nm.…”

One-dimentional periodic structure infiltrated by (PVA/CV + CF)-polymer for high-performance sensitivity

“…The first type is based on the radiation-induced luminescence and thermoluminescence effect (Ali Omer and Ali Bashir 2018;Rozaila et al 2016;Afifi 2021). The second type is based on the radiation-induced attenuation (RIA) effect (Cai et al 2017;Kashaykin et al 2019;Kashaykin et al 2015). The third type is based on varying the frequency of the Brillouin scattering in the distributed optical fibers (Alasia, et al 2005).…”

Loss prediction of three-level amplified spontaneous emission sources in radiation environment

“…[5,6] Generally, it is believed that the degradation mainly caused by the creation of color centers (CCs) that are responsible for a socalled radiation-induced attenuation (RIA). [7,8] And there coexist two combined effects: a) pump absorption by CCs which indirectly causes reduction of gain, and b) gain absorption by CCs. Besides, pump-induced bleaching in EDFs should also be in consideration.…”