Micro-machining of in-fiber 45° mirror optical fiber cantilever for dual axes acceleration measurement
Measurement Science and Technology(2022)
摘要
Abstract Focused Ion Beam (FIB) machining has been demonstrated to be capable of fabricating nano and micro-structure elements. In this paper we demonstrate techniques to design and fabricate 45˚ micro-mirrors into the end of multi-core fibers (MCF) using FIB processing. The mirrors are finished by a two-step process: a scanning process which is used to make a rough cut followed by a polishing process to create an optical surface finish mirror. The machined 45˚mirrors can be accurately aligned with optical fiber cores, which avoid issues associated with the alignment of external turning mirror components. Proof-of-concept demonstration shows that the fabricated structure is capable of measuring two axes acceleration interferometrically with a linear acceleration range from 0.2 g to 4 g and an r.m.s. error of 0.03 g. Acceleration measurements of frequency response up to 700 Hz and cross-sensitivity of ~4.2% are demonstrated.
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