Rare-Earth-Doped Glass Fiber for Background Rejection in Remote Fiber-Optic Raman Probes: Theory and Analysis of Holmium-Bearing Glass
Rare-Earth-Doped Glass Fiber for Background Rejection in Remote Fiber-Optic Raman Probes: Theory and Analysis of Holmium-Bearing Glass
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DOI：
10.1366/0003702934334624
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发表时间：
1993-10
影响因子：
3.5
通讯作者：
T. F. Cooney;C. Schoen;Shiv k. Sharma;D. M. Carey
中科院分区：
文献类型：
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作者：
T. F. Cooney;C. Schoen;Shiv k. Sharma;D. M. Carey
我们研究了在用于远程拉曼光谱采集的“自滤波”光纤中使用稀土掺杂玻璃的可行性。我们已经导出了理论处理，并使用了测量的相关样品和玻璃参数（例如，掺杂玻璃的光吸收和非弹性散射与弹性散射加反射的强度之比）来评估这种光纤的有用性。利用这些参数，Ho掺杂玻璃的光学吸收带，特别是，被发现是足够的强度和尖锐，使这种玻璃中使用的收集光纤的远程拉曼探针。短至2cm长的Ho掺杂玻璃纤维足以过滤不期望的激光辐射，同时允许高比例的样品拉曼信号通过。使用来自“可调谐”激光器的488.0-nm Ar+激光线或绿色或红色激光波长可确保激发在吸收带内并且接近掺杂玻璃的长波长透射截止。
We have investigated the feasibility of using rare-earth-doped glasses in “self-filtering” optical fibers used for remote Raman spectral collection. We have derived a theoretical treatment and have used the measured relevant sample and glass parameters (e.g., optical absorption of the doped glass and ratio of the intensities of inelastic scattering to elastic scattering plus reflection) to evaluate the usefulness of such fibers. With the use of these parameters, the optical absorption bands of Ho-doped glass, in particular, are found to be sufficiently intense and sharp to enable this glass to be used in the collection fiber of a remote Raman probe. Ho-doped glass fiber of as little as 2 cm in length is sufficient to filter undesirable laser radiation while permitting a high proportion of the sample Raman signal to pass. Use of the 488.0-nm Ar+ laser line or green or red laser wavelengths from a “tunable” laser can ensure that the excitation is within an absorption band and close to the long-wavelength transmission cut-on for the doped glass.