Grid-free 3D multiple spot generation with an efficient single-plane FFT-based algorithm
Journal article, 2009

Algorithms based on the fast Fourier transform (FFT) for the design of spot-generating computer generated holograms (CGHs) typically only make use of a few sample positions in the propagated field. We have developed a new design method that much better utilizes the information-carrying capacity of the sampled propagated field. In this way design tasks which are difficult to accomplish with conventional FFT-based design methods, such as spot positioning at non-sample positions and/or spot positioning in 3D, are solved as easily as any standard design task using a conventional method. The new design method is based on a projection optimization, similar to that in the commonly used Gerchberg-Saxton algorithm, and the vastly improved design freedom comes at virtually no extra computational cost compared to the conventional design. Several different design tasks were demonstrated experimentally with a liquid crystal spatial light modulator, showing highly accurate creation of the desired field distributions.


David Engström

University of Gothenburg

Anders Frank

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Mattias Goksör

University of Gothenburg

Jörgen Bengtsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Optics Express

1094-4087 (ISSN) 10944087 (eISSN)

Vol. 17 12 9989-10000

Subject Categories

Physical Sciences

Atom and Molecular Physics and Optics

Other Physics Topics

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