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Development of optical fibers for mid-infrared sensing: State of the art and recent achievements

机译:用于中红外传感的光纤的开发:最新技术和最新成果

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Chalcogenide glass fibers are matchless devices to collect mi-infrared signal. Depending on the spectroscopic strategy, different kind of optical fibers have been developed during the past 10 years. The first fibers have been fabricated from selenide glasses to implement Fiber Evanescent Wave Spectroscopy (FEWS). It is an efficient way to collect optical spectra in situ, in real time and even, in the future, in vivo. Thanks to selenide glass fibers, it is possible to record such spectra on the mid-infrared range from 2 to 11 μm. This working window gives access to the fundamental vibration band of most of biological molecules and numerous multi-disciplinary works have been led in biology and medicine. New glasses, only based on tellurium, have been recently developed, initially in the frame of the Darwin mission led by the European Space Agency (ESA). These glasses transmit light further toward the far-infrared and permit to reach the absorption band of CO_2 located at 15 μm as requested by the ESA. Moreover, these telluride glass fiber are also very interesting for FEWS and medical application. Indeed, they give access to the mid-infrared signal of biomolecules beyond 11 μm, where classical selenide glass fibers are blind. Alternatively, in order to fight against global warning, some optical fibers have been developed for the monitoring of the CO_2 stored into geological storage area underground. These fibers were doped with Dy~(3+) which emits a broad fluorescent band embedding the CO_2 absorption band at 4.3 μm. thus, these fibers are used both to transmit light and as secondary sources in the mid-infrared. To conclude, original microstructurated fibers have also been used for mid-infrared sensing. They exhibit a nice sensitivity compared to classical chalcogenide glass fibers.
机译:硫族化物玻璃纤维是收集微红外信号的无与伦比的设备。在过去的十年中,根据光谱策略的不同,已经开发出了不同种类的光纤。第一批纤维已经由硒化玻璃制成,以实现纤维Fiber逝波光谱(FEWS)。这是一种实时,实时甚至将来在体内收集光谱的有效方法。借助硒化玻璃纤维,可以在2至11μm的中红外范围内记录此类光谱。该工作窗口使人们能够接触到大多数生物分子的基本振动带,并且在生物学和医学领域已经进行了许多多学科的研究。最近,仅在由欧洲航天局(ESA)领导的达尔文任务的框架内,已经开发了仅基于碲的新型眼镜。这些玻璃按照ESA的要求,将光进一步朝着远红外方向传输,并允许到达15μm的CO_2吸收带。此外,这些碲化物玻璃纤维对于FEWS和医学应用也非常有趣。的确,它们可以访问超过11μm的生物分子的中红外信号,而传统的硒化玻璃纤维是盲目的。可替代地,为了与全局警告作斗争,已经开发了一些光纤用于监视存储在地下地质存储区域中的CO 2。这些纤维掺有Dy〜(3 +),Dy〜(3+)发出宽荧光带,嵌入了4.3μm的CO_2吸收带。因此,这些光纤既用于传输光,又用作中红外的次要光源。总而言之,原始的微结构纤维也已用于中红外传感。与经典硫属化物玻璃纤维相比,它们具有很好的灵敏度。

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