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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 2822–2835

Spoke wheel filtering strategy for on-axis flattop shaping

Tao Liu, Jiubin Tan, and Jian Liu  »View Author Affiliations

Optics Express, Vol. 18, Issue 3, pp. 2822-2835 (2010)

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Spoke wheel filtering strategy is developed using the proposed spoke wheel filter (SWF) and solving the nonlinear optimization model established by introducing a super-Gaussian function. Theoretical calculations through simulated annealing algorithm indicate that high focal depth is obtained by increasing the number of curved sectors composing SWF, while the peak-valley intensity oscillation is reduced by bending them appropriately and slightly changing their amplitude transmittances. The transverse in-focus spot compresses when the center-shaded circle of SWF enlarging. Comparison shows that SWF outperforms radial-symmetric pupil filters in its largely reduced intensity oscillation and very flexible design of focal depth extension.

© 2010 OSA

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(100.6640) Image processing : Superresolution
(110.1220) Imaging systems : Apertures

ToC Category:
Diffraction and Gratings

Original Manuscript: December 4, 2009
Revised Manuscript: January 14, 2010
Manuscript Accepted: January 22, 2010
Published: January 26, 2010

Tao Liu, Jiubin Tan, and Jian Liu, "Spoke wheel filtering strategy for on-axis flattop shaping," Opt. Express 18, 2822-2835 (2010)

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