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

Artikel i vetenskaplig tidskrift
Författare David Engström
Anders Frank
Jan Backsten
Mattias Goksör
Jörgen Bengtsson
Publicerad i Optics Express
Volym 17
Nummer/häfte 12
Sidor 9989-10000
ISSN 1094-4087
Publiceringsår 2009
Publicerad vid Institutionen för fysik (GU)
Sidor 9989-10000
Språk en
Länkar www.opticsinfobase.org/oe/abstract....
Ämneskategorier Fysik, Optik, Beräkningsfysik

Sammanfattning

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.

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