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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 27, Iss. 12 — Dec. 1, 2010
  • pp: 2602–2612

Structure of optical singularities in coaxial superpositions of Laguerre–Gaussian modes

Taro Ando, Naoya Matsumoto, Yoshiyuki Ohtake, Yu Takiguchi, and Takashi Inoue  »View Author Affiliations

JOSA A, Vol. 27, Issue 12, pp. 2602-2612 (2010)

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We investigate optical singularities in coaxial superpositions of two Laguerre–Gaussian (LG) modes with a common beam waist from the viewpoints of a general formulation of phase structure, experimental generation of various superposition beams, and evaluation of the generated beams’ fidelity. By applying a holographic phase-amplitude modulation scheme using a phase-modulation-type spatial light modulator, output fidelity beyond 0.960 was observed under several typical conditions. Additionally, an elliptic-type folded singularity, which provides a different class of phase structures from familiar helical singularities, was predicted and observed in a superposition involving two LG modes of both radially and azimuthally higher orders.

© 2010 Optical Society of America

OCIS Codes
(090.1760) Holography : Computer holography
(100.5090) Image processing : Phase-only filters
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(140.3300) Lasers and laser optics : Laser beam shaping
(260.6042) Physical optics : Singular optics

ToC Category:
Physical Optics

Original Manuscript: September 14, 2010
Manuscript Accepted: October 19, 2010
Published: November 17, 2010

Taro Ando, Naoya Matsumoto, Yoshiyuki Ohtake, Yu Takiguchi, and Takashi Inoue, "Structure of optical singularities in coaxial superpositions of Laguerre–Gaussian modes," J. Opt. Soc. Am. A 27, 2602-2612 (2010)

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