Abstract

In this Letter, we demonstrate, to the best of our knowledge, a novel method to generate an orbital angular momentum (OAM) based on the principle of the modal interference in a two-mode fiber. At the interference dips, the left- or right-handed circular polarized HE11 modes can be ideally converted into the ±1-order OAM beam. To verify this concept, we employed the femtosecond laser micro-processing technology to write micro-waveguides in the two-mode fiber and hence realized the in-line modal interferometer. To enhance the mode conversion efficiency at the dips, we optimized the waveguide parameters both theoretically and experimentally. The interference spectrum and spiral/fork patterns confirm the OAM beam generation with an efficiency as high as 99%.

© 2019 Optical Society of America

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Supplementary Material (3)

NameDescription
» Visualization 1       The interference patterns between modes change with scanning the laser wavelength from the peak position (1520nm) to the dip position(1580.4nm).
» Visualization 2       When the input light is linearly polarized by aligning the linear polarizer, the patterns before interfering with the Gaussian-reference beam change with rotating the quarter-wave plate located after the linear polarizer.
» Visualization 3       The spiral rotation patterns evolve when OAM-1 beam is turned to be OAM+1 beam by changing the polarization state.

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