Fiber-diffraction Interferometer using Coherent Fiber Optic Taper

Details Fiber-diffraction Interferometer using Coherent Fiber Optic Taper Fiber-diffraction Interferometer using Coherent Fiber Optic Taper

2010-07-11

arxiv.org/abs/1007.1807v1

Physics

Optics

Scientific paper

We present a fiber-diffraction interferometer using a coherent fiber optic taper for optical testing in an uncontrolled environment. We use a coherent fiber optic taper and a single-mode fiber having thermally-expanded core. Part of the measurement wave coming from a test target is condensed through a fiber optic taper and spatially filtered from a single-mode fiber to be reference wave. Vibration of the cavity between the target and the interferometer probe is common to both reference and measurement waves, thus the interference fringe is stabilized in an optical way. Generation of the reference wave is stable even with the target movement. Focus shift of the input measurement wave is desensitized by a coherent fiber optic taper.

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