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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 25 — Dec. 3, 2012
  • pp: 27212–27221

Three-level filter for increased depth of focus and Bessel beam generation

Colin JR Sheppard and Shalin Mehta  »View Author Affiliations


Optics Express, Vol. 20, Issue 25, pp. 27212-27221 (2012)
http://dx.doi.org/10.1364/OE.20.25.027212


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Abstract

A novel axially-symmetric filter for increasing focal depth and generating an approximation to a Bessel beam is proposed. It consists of an array of rings of strength –1,0 and 1. The design is based on an analytic solution, and combines high resolution in the transverse direction with good efficiency. One presented design increases the depth of focus compared with a standard lens by more than 30 times, with a very flat axial intensity distribution over this range. Effects of discretization are discussed. Various different approaches to increasing depth of focus are compared, to put the new design into perspective.

© 2012 OSA

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1940) Diffraction and gratings : Diffraction
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(110.6980) Imaging systems : Transforms
(350.6980) Other areas of optics : Transforms

ToC Category:
Diffraction and Gratings

History
Original Manuscript: July 17, 2012
Revised Manuscript: August 23, 2012
Manuscript Accepted: August 23, 2012
Published: November 19, 2012

Citation
Colin JR Sheppard and Shalin Mehta, "Three-level filter for increased depth of focus and Bessel beam generation," Opt. Express 20, 27212-27221 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-25-27212


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