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Various LOF structures. (a) LOF with a too-large radius of lens curvature (R). (b) LOF optimized as a probe for a Michelson-type interferometer. (c) LOF with a small R for a common-path-type interferometer. (b,c) are designed to have the same working distance but different back-coupling efficiency (black line: incident beam, red line: beam reflected at the LOF surface).
