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Optical fiber Fabry-Perot interferometer cavity fabricated by femtosecond laser-induced water breakdown for refractive index sensing

机译:飞秒激光诱导的水击穿构造的法布里-珀罗光纤干涉仪腔,用于折射率传感

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摘要

The Fabry-Perot interferometer (FPI) cavity in a single-mode fiber with two open faces was fabricated by using the method of femtosecond laser-induced water breakdown. Then the FPI cavity was annealed by the arc discharge to greatly smooth its internal surface. The whole fabrication process features simple operation and high efficiency. The fabricated FPI cavity exhibits a perfect interferometer spectrum with reflection loss of only -3 dB and fringe visibility of almost 30 dB. It can be used as a perfectly reliable liquid refractive index sensor, as it exhibits high sensitivity (1147.48 nm/RIU), good linearity (99.93%), good repeatability, high actual measurement accuracy (1.29 × 10~(-4)RIU), large measurement range, and good temperature insensitive characteristic.
机译:采用飞秒激光诱导水击穿的方法,制造了具有两个开放面的单模光纤中的Fabry-Perot干涉仪(FPI)腔。然后,通过电弧放电对FPI腔进行退火,以极大地平滑其内表面。整个制造过程具有操作简单,效率高的特点。制成的FPI腔具有完美的干涉仪光谱,反射损耗仅为-3 dB,边缘可见度几乎为30 dB。它具有高灵敏度(1147.48 nm / RIU),良好的线性度(99.93%),良好的重复性以及较高的实际测量精度(1.29×10〜(-4)RIU),因此可以用作完美可靠的液体折射率传感器,测量范围大,对温度不敏感的特性好。

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