| The Fabry-Perot cavity based on concave fibers has the advantages of high fineness,small mode volume,and large locking bandwidth,and can significantly enhance the interaction between light field and matter.The Fabry-Perot cavity can interact with different types of quantum systems such as atoms,ions,molecules,NV centers,and mechanical oscillators,and provide a promising platform for future implementations such as single photon sources,atomic entangled states,high fidelity quantum memories,and quantum networks.At the same time,the Fabry-Perot resonator based on concave optical fibers has important values in classic fields such as Raman spectroscopy,scanning microscopy,microcavity laser,and ultra-sensitive sensors.In this paper,we mainly conducted theoretical and experimental research on the preparation and application of concave optical fibers,including building a carbon dioxide pulsed laser micro-nano fabricating system;constructing a high finesse fiber Fabry-Perot cavity using fabricated concave optical fibers;proposing an in-fiber Michelson interferometer based on concave optical fibers.The specific contents are as follows:(1)We introduced the research progress of concave fiber Fabry-Perot resonators,various methods for fabricating concave fiber in the world,and their application in the field of microcavity and interferometer.(2)We designed and built a CO2 pulsed laser fabrication system,which used pulsed laser to produce concave optical fibers with a smooth surface and a large radius of curvature.The radius of curvature measured by atomic force microscopy can range from50μm to 700μm.(3)We constructed a theoretical model of optical fiber Fabry-Perot cavities and analyzed in detail the relationship among cavity parameters such as fiber Fabry-Perot cavity finesse,coupling efficiency,and concave fiber structural parameters.We used two concave optical fibers coated with 852 nm high reflectivity dielectric on their surfaces to build a concave optical fiber Fabry-Perot cavity with a fineness of about 4120 in the experiment.(4)We proposed an in-fiber Michelson interferometer fabricated by a single carbon dioxide laser pulse.The smoothness and shape controllability of the concave surface on the optical fiber make the fringe visibility of the interferometer more than 15 d B,and the temperature sensitivity of the interferometer is 11.13 pm/℃.These advantages make it a promising candidate in practical applications. |
