Acousto-optic generation of orbital angular momentum states of light in a tapered optical fiber

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We demonstrate an acousto-optic mode converter based on a tapered optical fiber to efficiently generate orbital angular momentum states of light. In our scheme an acoustic wave is deployed to the waist of tapered optical fiber where two degenerate HE21 modes leading to + 1 and -1 orbital angular momentum eigen-modes are resonantly excited. The excitation of TM01 and TE01 modes is suppressed by enlarging the intermodal index difference between near-degenerate spatial modes. Numerical calculation for optimization of the taper diameter is provided. The experimental characterization of generated states is performed by analyzing the output far-field pattern and the spatial interference fringes with a uniform reference beam.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-11
Language
English
Article Type
Article
Citation

CURRENT APPLIED PHYSICS, v.18, no.11, pp.1441 - 1446

ISSN
1567-1739
DOI
10.1016/j.cap.2018.08.015
URI
http://hdl.handle.net/10203/246300
Appears in Collection
PH-Journal Papers(저널논문)
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