研究目的
To review the effects of high-energy (β) electrons irradiation on the absorptive and fluorescent properties of silica-based optical fibers doped with rare earths and metals, and to understand the processes behind these phenomena for potential applications in dosimetry and space technology.
研究成果
The study demonstrates that a diversity of effects can be encouraged at irradiating optical silica-based fibers with dopants of different kinds by high-energy β-electrons. The findings are valuable for applications in dosimetry and space technology and for designing fiber devices for telecom systems.
研究不足
The study is limited by the inability to detect IA arising in the UV-region below 400 nm using the experimental equipment. Additionally, the effect of spontaneous IA recovering and the role of short-living components in the decay of IA could not be completely avoided.
1：Experimental Design and Method Selection:
The study involved irradiating fiber samples with a controllable linear accelerator of the LU type that emits β-electrons with a narrow-band energy spectrum (~6 MeV) in a short-pulse (~5 μs) mode. The samples were placed into the accelerator’s chamber for various time intervals to provide growing irradiation doses.
2：Sample Selection and Data Sources:
Fiber samples with lengths of around 1–2 m were used, doped with rare earths (Yb, Ce) and metals (Bi).
3：List of Experimental Equipment and Materials:
A white light source and optical spectrum analyzer (OSA) were used for measuring optical transmission spectra. A He-Ne laser (543 nm) and UV mercury lamp were used for posterior optical bleaching experiments.
4：Experimental Procedures and Operational Workflow:
The irradiated fibers were left for 2 weeks prior to spectral measurements to avoid the role of short-living components in the decay of induced absorption (IA). Measurements were done during a limited time (2–3 weeks) to diminish the effect of spontaneous IA recovering.
5：Data Analysis Methods:
Attenuation spectra were recorded before and after each stage of β-irradiation and posterior exposure to light. The difference spectra in terms of IA were obtained after subtraction of the attenuation spectra of pristine samples from the ones taken after a certain dose of β-irradiation.
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