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Schematic of a lensed optical fiber (LOF) structure. Lc: length of coreless silica fiber (CSF), Lf: working distance or focal length, Lb: focal length of reflected beam, R: radius of lens curvature, w0: half of the mode-field diameter (MFD) of single-mode fiber (SMF), w: beam spot at each interesting position, n: refractive index of the medium.
