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Illustration of fabrication of a FPI cavity inside the fiber [77]. (a) The creation of microholes, on the order of ∼1 μm using a femtosecond laser, through the center of the fiber core. (b) Splicing of the two fiber ends with microholes. (c) Formation of the FP cavity. (d) Introducing the vertical cross-through microcavity for the fabrication of microchannels.
