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The transverse intensity profiles of (a-1) Gaussian beam from a conventional single mode fiber and (a-2) Bessel-like beam from proposed fiber device taken by a CCD camera at the propagation distance of 100 μm from fiber tip in the air. (a-3) transverse line profiles of Gaussian and Bessel-like beam from (a-1) and (a-2). (b) the intensity and (c) the diameter of the central peak of Bessel-like beam along the propagation axis in the air.
