A method for adjusting the working distance and spot size of a fiber probe while\nsuppressing or enhancing the back-coupling to the lead-in fiber is presented. As the optical fiber\nprobe, a lensed optical fiber (LOF) was made by splicing a short piece of coreless silica fiber (CSF) on\na single-mode fiber and forming a lens at the end of the CSF. By controlling the length of the CSF and\nthe radius of lens curvature, the optical properties of the LOF were adjusted. The evolution of the\nbeam in the LOF was analyzed by using the Gaussian ABCD matrix method. To confirm the idea\nexperimentally, 17 LOF samples were fabricated and analyzed theoretically and also experimentally.\nThe results show that it is feasible in designing the LOF to be more suitable for specific or dedicated\napplications. Applications in physical sensing and biomedical imaging fields are expected.
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