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Treball de fi de grauData de publicació
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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/59950
Beam steering with spatial light modulators: Quantisation effects
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Beam steering can be achieved by sending holograms to a phase-only spatial light modulator (SLM). The use of holograms, defined by linear phases, induce a one dimensional transverse shift of the beam spot at the focal plane of a lens. An SLM is formed by N pixels and uses a limited number of grey levels, M. These limitations produce the quantisation of the phase values introduced on the incoming beam and decrease the accuracy on spot positioning.
We have built a system in which a laser beam is focused by a lens after being reflected by an SLM. Different positions of the focal spot have been captured by a camera and accurately determined by image processing. Measurements were done with N=100 and M=16. We proved that quantisation effects are not relevant in most of the positions, except for certain locations, which produce such errors on spot positioning that need to be avoided.
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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutora: Estela Martín Badosa
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RIBOT THUNNISSEN, Astrid. Beam steering with spatial light modulators: Quantisation effects. [consulta: 23 de gener de 2026]. [Disponible a: https://hdl.handle.net/2445/59950]