Jia Ming, Wen Jianxiang, Pan Xiangping, Xin Zhiwei, Pang Fufei, He Linfeng, Wang Tingyun
Opt Express. 2021 Jan 18;29(2):1210-1220. doi: 10.1364/OE.413822.
A novel tapered fiber-optic radiation sensor (TFRS) based on cerium (Ce) and terbium (Tb) co-doped YAG scintillation crystals is demonstrated for the first time. Using the CO laser-heated method, a Ce/Tb:YAG crystal is well embedded into silica glass cladding without any cracks. The scintillation light emitted from the YAG scintillation crystal can be directly coupled into the derived silica optical fiber by the tapered region. The loss of the derived optical fiber is 0.14 dB/cm, which is one order of magnitude lower than the 1.59 dB/cm of the YAG crystal in the TFRS. Subsequently, strong photo- and radio-luminescence of Tb (D→F) ions in TFRS are achieved under ultraviolet light and high-energy ray excitation, respectively. In particular, a prominent remote radiation response of the TFRS is presented under excitation by γ-rays through fusion splicing with multimode optical fibers. The response is approximately four times larger than that of a plastic scintillation fiber (BCF-12) sensor. Furthermore, the results possess high stability as well as a good linearity between the radiation dose rate and the response intensity. The TFRS in combination with an all-silica fiber system is a promising candidate for remote radiation detection.
首次展示了一种基于铈（Ce）和铽（Tb）共掺杂钇铝石榴石（YAG）闪烁晶体的新型锥形光纤辐射传感器（TFRS）。采用CO激光加热法，将Ce/Tb:YAG晶体很好地嵌入石英玻璃包层中，无任何裂纹。YAG闪烁晶体发出的闪烁光可通过锥形区域直接耦合到引出的石英光纤中。引出光纤的损耗为0.14 dB/cm，比TFRS中YAG晶体的1.59 dB/cm低一个数量级。随后，分别在紫外光和高能射线激发下，实现了TFRS中Tb（D→F）离子强烈的光致发光和放射发光。特别是，通过与多模光纤熔接，在γ射线激发下，TFRS呈现出显著的远程辐射响应。该响应约为塑料闪烁光纤（BCF-12）传感器的四倍。此外，结果具有高稳定性，并且辐射剂量率与响应强度之间具有良好的线性关系。结合全石英光纤系统的TFRS是远程辐射检测的一个有前途的候选者。
