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Grid-free 3D multiple spot generation with an efficient single-plane FFT-based algorithm
DOI:10.1364/OE.17.009989.png)
Abstract
En 中文
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. (C) 2009 Optical Society of America
Keywords:
DIFFRACTIVE OPTICAL-ELEMENTS
FOURIER-TRANSFORM ALGORITHM
ITERATIVE CALCULATION
PHASE
HOLOGRAMS
DESIGN
BEAM
KINOFORM
WRITTEN
Journal
IF:
3.3
Papers:
6.1W
Citations:
14.3W
Organization
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