Femtosecond Laser Internal Processing for an Optical Fiber Sensor Inducing Interference of Optical Waveguide
Femtosecond Laser Internal Processing for an Optical Fiber Sensor Inducing Interference of Optical Waveguide
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DOI：
10.1007/978-3-319-50904-4_75
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Naoki Chinen;M. Shiraishi;K. Goya;A. Seki;S. Kubodera;Kazuhiro Watanabe
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文献类型：
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作者：
Naoki Chinen;M. Shiraishi;K. Goya;A. Seki;S. Kubodera;Kazuhiro Watanabe
提出了一种利用飞秒激光内部加工的新型光纤传感结构。该传感器由聚焦的超短脉冲激光在光纤纤芯和包层交界处形成的腔区(空腔)组成。包层模是由散射光在空穴处产生的，与光纤周围的外界物质相互作用后，会引起纤芯和包层模的干涉。由于周围材料的折射率，诱导干涉光谱发生了漂移。通过实验观察到了幅度大于0.20分贝的干涉光谱。在RI为1.000-1.333的范围内，该传感器的灵敏度达到了31.8 nm/RIU。当传感器部分在空气中并浸入纯水中时，可以确定干涉光谱，但当传感器部分浸入具有相对较高阻力的介质中时，则无法获得干涉光谱。
A new optical fiber sensing structure was proposed by using femtosecond laser internal processing. The proposed sensor was composed of cavity regions (voids) fabricated by focused ultra-short pulse laser beam in line at the interface of optical fiber between core and cladding. Cladding-modes was induced by scattering propagation light at voids, and caused interference of core and cladding modes after interacting with external materials around the optical fiber. Induced interference spectrum was shifted due to refractive index of surrounding materials. Through some experiments interference spectrum was observed with having amplitude more than 0.20 dB. The sensitivity of proposed sensor has been achieved to reach 31.8 nm/RIU for a RI range of 1.000–1.333. The interference spectrum was ascertainable when the sensor portion was in air and immersed into pure water, but not gained when sensor portion was immersed into mediums having relatively higher RI.