| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 14, Number 1, 2018
|
|
|---|---|---|
| Article Number | 19 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1186/s41476-018-0088-6 | |
| Published online | 14 August 2018 | |
Research
Multi-spectral random illumination using a liquid crystal spatial light modulator
Automatic Target Recognition Key Laboratory, National University of Defense Technology, Deya Road, 410073, ChangSha, China
Received:
8
March
2018
Accepted:
30
July
2018
Background: Using phase-only liquid crystal spatial light modulator (LC-SLM) to generate random illumination is always used in phase-retrieval and single pixel imaging as it have high energy efficiency. While the methods were only used to generate monochromatic illumination. This paper aims to use LC-SLM generating the multi-spectral random illumination.
Methods: The method requires only one SLM; multiple laser beams are simultaneously used to illuminate the entire SLM. Random voltages designed with a probability density function (PDF) are applied to modulate the random phases in the multi-spectral emitted light beam, leading to random amplitude spots in the far field. By optimize the PDF, the random illumination spot can be close to uniform distributed with high efficiency.
Results: The average intensities of the random light spots are almost uniformly distributed within the range of the first diffraction order. And the zero-order beam is eliminated. The proposed method has a high energy efficiency and refresh rate and does not require the SLM to have an excessive modulation range.
Conclusion: This paper provides a method to generate multi-spectral random illumination using a LC-SLM, which can be used in phase-retrieval and single pixel imaging.
Key words: Spatial light modulators / Multi-spectrum / Random illumination / Genetic algorithm
© The Author(s) 2018
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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