Suppression of the zero-order diffracted beam from a pixelated spatial light modulator by phase compression
| Autor: | Jinyang Liang, Michael F. Becker, Fredrik K. Fatemi, Sih Ying Wu |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Diffraction
Spatial light modulator Materials science business.industry Phase (waves) Holography Physics::Optics Diffraction efficiency Atomic and Molecular Physics and Optics law.invention Optics law Optical transfer function Electrical and Electronic Engineering business Engineering (miscellaneous) Phase modulation Beam (structure) |
| Zdroj: | Applied optics. 51(16) |
| ISSN: | 1539-4522 |
| Popis: | Phase compression is used to suppress the on-axis zero-order diffracted (ZOD) beam from a pixelated phase-only spatial light modulator (SLM) by a simple modification to the computer generated hologram (CGH) loaded onto the SLM. After CGH design, the phase of each SLM element is identically compressed by multiplying by a constant scale factor and rotated on the complex unit-circle to produce a cancellation beam that destructively interferes with the ZOD beam. Experiments achieved a factor of 3 reduction of the ZOD beam using two different liquid-crystal SLMs. Numerical simulation analyzed the reconstructed image quality and diffraction efficiency versus degree of phase compression and showed that phase compression resulted in little image degradation or power loss. |
| Databáze: | OpenAIRE |
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