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首页> 外文会议>International conference on advanced engineering - theory and applications >Femtosecond Laser Internal Processing for an Optical Fiber Sensor Inducing Interference of Optical Waveguide
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Femtosecond Laser Internal Processing for an Optical Fiber Sensor Inducing Interference of Optical Waveguide

机译：飞秒激光内部处理的光纤传感器引起光波导的干扰

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摘要

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.
机译：利用飞秒激光内部处理技术，提出了一种新型的光纤传感结构。所提出的传感器由在芯和包层之间的光纤界面处聚焦的超短脉冲激光束成一直线的空腔区域（空隙）组成。包层模式是由传播光在空隙处的散射引起的，并在与光纤周围的外部材料相互作用后引起纤芯和包层模式的干涉。感应干涉光谱由于周围材料的折射率而移动。通过一些实验，观察到幅度大于0.20 dB的干扰频谱。对于1.000-1.333的RI，建议的传感器的灵敏度已达到31.8 nm / RIU。当传感器部分处于空气中并浸入纯净水中时，可确定干涉光谱，而当传感器部分浸入具有相对较高RI的介质中时，则无法获得干涉光谱。

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