High-fidelity phase and amplitude control of phase-only computer generated holograms using conjugate gradient minimisation
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We demonstrate simultaneous control of both the phase and amplitude of light using a conjugate gradient minimisation-based hologram calculation technique and a single phase-only spatial light modulator (SLM). A cost function which incorporates the inner product of the light field with a chosen target field within a defined measure region is efficiently minimised to create high fidelity patterns in the Fourier plane of the SLM. A fidelity of F = 0.999997 is achieved for a pattern resembling an LG0/1 mode with a calculated light-usage efficiency of 41.5%. Possible applications of our method in optical trapping and ultracold atoms are presented and we show uncorrected experimental realisation of our patterns with F = 0.97 and 7.8% light efficiency.
Bowman , D , Harte , T L , Chardonnet , V , De Groot , C , Denny , S J , Le Goc , G , Anderson , M , Ireland , P , Cassettari , D & Bruce , G D 2017 , ' High-fidelity phase and amplitude control of phase-only computer generated holograms using conjugate gradient minimisation ' Optics Express , vol 25 , no. 10 , pp. 11692-11700 . DOI: 10.1364/OE.25.011692
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Funding: Leverhulme Trust (RPG-2013-074); EPSRC (EP/G03673X/1; EP/L015110/1).
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