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 …