- Research Article
- Open access
- Published:
Design of Extended Depth-of-Focus Laser Beams Using Orthogonal Beam Expansions
EURASIP Journal on Advances in Signal Processing volume 2005, Article number: 618172 (2005)
Abstract
Laser beams with extended depth of focus have many practical applications, such as scanning printed bar codes. Previous work has concentrated on synthesizing such beams by approximating the nondiffracting Bessel beam solution to the wave equation. In this paper, we introduce an alternate novel synthesis method that is based on maintaining a minimum MTF value (contrast) over the largest possible distance. To achieve this, the coefficients of an orthogonal beam expansion are sequentially optimized to this criterion. One of the main advantages of this method is that it can be easily generalized to noncircularly symmetrical beams by the appropriate choice of the beam expansion basis functions. This approach is found to be very useful for applications that involve scanning of the laser beam.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
About this article
Cite this article
Goren, D.P., Katz, J. & Bergstein, L. Design of Extended Depth-of-Focus Laser Beams Using Orthogonal Beam Expansions. EURASIP J. Adv. Signal Process. 2005, 618172 (2005). https://doi.org/10.1155/ASP.2005.1617
Received:
Revised:
Published:
DOI: https://doi.org/10.1155/ASP.2005.1617