Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/59950
Title: | Beam steering with spatial light modulators: Quantisation effects |
Author: | Ribot Thunnissen, Astrid |
Director/Tutor: | Martín Badosa, Estela |
Keywords: | Modulació (Electrònica) Holografia Treballs de fi de grau Modulation (Electronics) Holography Bachelor's theses |
Issue Date: | Jun-2014 |
Abstract: | 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. |
Note: | Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Any: 2014, Tutora: Estela Martín Badosa |
URI: | http://hdl.handle.net/2445/59950 |
Appears in Collections: | Treballs Finals de Grau (TFG) - Física |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
TFG-Ribot-Thunnissen-Astrid.pdf | 404.75 kB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License