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A new fabrication method for a locally micro-structured fiber Bragg grating (LMFBG) is proposed and demonstrated. With this new type of LMFBG, simultaneous sensing of compressive force and temperature is possible. The LMFBG consists of a circumferential groove of ∼86 μm length and ∼27 μm depth in the middle of a type I FBG. Direct femtosecond (fs) laser ablation was applied to manufacture the groove...
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