Abstract
A Bessel-like beam was generated in a novel all-fiber integrated structure. A concentric ring intensity pattern was achieved by the multimode interference along the coreless silica fiber, which was then focused by the integrated micro-lens to result in a Bessel-like beam. The average beam diameter of 7.5 μm maintained over 500 μm axial length for a continuous wave Yb-doped fiber laser input oscillating at the wavelength of 1.08 μm. The generated beam was successfully applied to two-dimension optical trapping and longitudinal transport of multiple dielectric particles confirming its unique non-diffracting and self-reconstructing nature. Physical principle of operation, fabrication, and experimental results are discussed.
Highlights
Laser beam shaping [1] has recently received intense attention in atomic physics and nano-bio science as well as ultra high-precision laser processing
Bessel beams or Bessellike beams have been on the center of focus for their unique non-diffracting and selfreconstructing nature, which were not attainable in conventional Gaussian beam optics limited by the classical Rayleigh range [2,3]
A conical shaped refractor called as an axicon [3,9] has been the key optical element in recent Bessel beam generation (BBG) research, where the incident plane wave forms a concentric interference pattern similar to a Bessel function, J0(x), by its conical surface
Summary
Laser beam shaping [1] has recently received intense attention in atomic physics and nano-bio science as well as ultra high-precision laser processing. The Bessel beams have enabled new novel scientific investigations such as longitudinal optical trapping of multiple mesoscopic particles along the axial direction [4], high resolution optical coherence tomography over a large depth [5], and three-dimensional nano-micro processing [6] to name a few. Novel attempts have been reported using fiber optics for BBG [10,11] to provide an integrated micro-solution, which is inherently compatible to rapidly developing rare earth ion doped fiber lasers [12]. The authors have reported a novel composite optical fiber BBG device in the visible lasers with a non-diffracting length over 1 mm comparable to bulk axicons [11]. We successfully demonstrated twodimensional optical trapping and transport of multiple dielectric particles along the axial direction to confirm both non-diffracting and self-reconstructing natures of the Bessel-like beam
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