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Fiber Focusing Lens The light output from the optical fiber can be focused on a specific position to form an extremely small spot. It can also act as a converging function for the returning light beam after being reflected by the test object, and then measure different characteristics by comparing the emitted and returning light beams in terms of phase, energy, spectrum, and wavelength. It can be used for precision surface detection, interferometric imaging, distance detection, etc. It also can be used in industrial automation, medical OCT, optical testing instruments, etc.