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We present a high-contrast extrinsic Fabry–Pérot interferometer (HCEFPI) with an in-fiber ellipsoidal cavity. The ellipsoidal air-microcavity is formed by splicing together a single-mode fiber and a photonic crystal fiber with the simple arc-discharge technique. The propagation loss in the cavity can be very low due to the confocal cavity and very short cavity. Experiments have shown that the HCEFPI...
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