A conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

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Abstract

Direct minimisation of a cost function can in principle provide a versatile and highly controllable route to computational hologram generation. However, to date iterative Fourier transform algorithms have been predominantly used. Here we show that the careful design of cost functions, combined with numerically efficient conjugate gradient minimisation, establishes a practical method for the generation of holograms for a wide range of target light distributions. This results in a guided optimisation process, with a crucial advantage illustrated by the ability to circumvent optical vortex formation during hologram calculation. We demonstrate the implementation of the conjugate gradient method for both discrete and continuous intensity distributions and discuss its applicability to optical trapping of ultracold atoms.
Original languageEnglish
Pages (from-to)26548-26558
Number of pages11
JournalOptics Express
Volume22
Issue number22
Early online date20 Oct 2014
DOIs
Publication statusPublished - 3 Nov 2014

Keywords

  • Cond-mat.quant-gas
  • Physics.atom-ph
  • Physics.optics

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