6 December 2006 Novel design digital holographic system with LC spatial light modulators for diffractive element production
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Proceedings Volume 6023, Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals; 602302 (2006); doi: 10.1117/12.648155
Event: Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 2005, Alushta, Ukraine
Abstract
Liquid crystal displays in different modes are suitable due to their birefringence properties and wide transmission range. The paper discussed advantages amplitude-phase modulators and focused on boundary conditions for the application in digital holography (generation of 3D light wave) and for dynamic pattern generation. Implementation demands are discussed on the example of an optical system for parallel recording and optical reconstruction of digital hologram. Optical methods based on digital holography are highly effective for diffractive element synthesis. Modern production of digital hologram is characterized by high degree of flexibility and complexity. According to this the use of proposed method is useful for designing and developing an optical system able not only for fringe pattern fabric structures but as well to allow more complex pattern including singular for image forming. We report on a method for synthesis of digital holograms taken with interference of laser beams diffracted on a spatial light modulator. The proposed technique for modeling of adaptive diffractive elements computes the propagation of the complex optical wavefront diffracted by the object and used to determine the needed spatial light modulator (SLM) pattern. The extension of new method of modeling diffraction on amplitude-phase mask and possibilities of its practical application such as computer modeling of diffraction on a SLM, which consists of squared cells, for a wavefront reconstruction are considered. Conclusions regarding the possibilities the representation the arbitrary fields by using the discrete matrix of elementary diffractive aperture cell for enhancement of iteration algorithm of hologram synthesis and phase retrieval are arrived at. Proposed method for computer-generated holograms (CGH) enables one to synthesize CGH's and simulate digital image processing techniques for 3D image reconstruction. The process does not contain any Fourier transform calculations, and can thus be performed directly by grating recorder in line with recording. Nowadays miniaturized CCD and recent successes in optical spatial light modulator system devices allow building compact digital holographic system. Combining the original dot-matrix method with interferometric image forming allows obtaining new visual effects for hologram or diffractive elements synthesis. The new approach in this project is the idea of using the optical interference field is recorded at the same time in different areas to give multiple grating. Thus the image cell that are written are not separated into discrete dots of diffraction grating, like conventional dot-matrix spots, but form a continuous recording over relatively large area. Some advantages are that the basic cell, or pixel, is composed of not only a set of diffraction grating with various spatial frequencies but also may contain arbitrary pattern form and contain the hidden image or coding visual information. The result obtained by numerical and experimental means are presented together with a discussion of the limitations and further possibilities of this method.
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Ruslan Lymarenko, Oksana Budnyk, "Novel design digital holographic system with LC spatial light modulators for diffractive element production", Proc. SPIE 6023, Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 602302 (6 December 2006); doi: 10.1117/12.648155; https://doi.org/10.1117/12.648155
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KEYWORDS
Digital holography

Diffraction

Holograms

Diffraction gratings

Holography

Spatial light modulators

Image restoration

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