Numerical and optical reconstruction of digital off-axis Fresnel holograms

Evtikhiev, Nikolay N.; Starikov, Sergey N.; Cheryomkhin, Pavel A.; Krasnov, Vitaly V.; Rodin, Vladislav G.

doi:10.1117/12.922612

Cited by 15 publications

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“…Phase liquid crystal (LC) spatial light modulators 1,2 (SLM) are widely used in various applications such as diffractive optics, optical metrology, digital holography [3][4][5] , wave-front coding [6][7] and others due to its high spatial resolution and diffractive efficiency. State of the art LC SLM are characterized by high quantities of pixels (up to 10 7 ), addressed phase levels (up to 256), modulation depth (up to 10π) and decent frame rate (typically 60 Hz).…”

Section: Introductionmentioning

confidence: 99%

Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications

et al. 2014

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Phase liquid crystal spatial light modulators (LC SLM) are widely used in optical applications such as real-time imaging of holograms and diffractive optical elements, which require high stability and linearity of phase modulation. However state of the art LC SLM with high resolution use digital voltage addressing scheme which, unfortunately, leads to phase fluctuations in time period of one frame. Fluctuations characteristics depend on SLM voltage addressing sequence used. We report results of measurement of phase characteristics of LC SLM "HoloEye PLUTO VIS". This SLM is supplied with three different addressing sequences: "18-6", "5-5" and "0-6". Dynamics of phase fluctuations were measured for all signal values (0-255) with temporal resolution of 0.5 ms in time period of one frame for available addressing sequences. Default sequence "18-6" provided phase deviation 0.24 pi. Lowest deviation 0.07 pi was achieved with sequence "0-6". Due to high periodicity of fluctuations it is possible to implement synchronization of SLM and registering camera or light source to reduce fluctuation effects. This was experimentally implemented using DVI video signal for synchronization of SLM and camera. With its application minimum phase deviation 0.013 pi was achieved with sequence "18-6" which is 5 times lower than achievable without synchronization.

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Section: Introductionmentioning

confidence: 99%

Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications

et al. 2014

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“…Numerical reconstruction implements methods of calculation of light field propagation from digital hologram plane to object plane. These methods are direct calculation of Fresnel diffraction [4] , angular spectrum propagation [5] and others [6][7][8][9][10][11][12][13][14] . Most widespread method of optical reconstruction implements digital hologram imaging with spatial light modulators (SLM) and their illumination with laser radiation [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

“…Registered interference pattern created by object and reference beams is transferred to the computer and then processed. Reconstruction of images from digital holograms can be accomplished numerically [1,[4][5][6][7][8][9][10][11][12][13][14] or optically [14][15][16] . Numerical reconstruction implements methods of calculation of light field propagation from digital hologram plane to object plane.…”

Section: Introductionmentioning

confidence: 99%

“…Most widespread method of optical reconstruction implements digital hologram imaging with spatial light modulators (SLM) and their illumination with laser radiation [14][15][16] . Optical reconstruction of digital holograms is used for remote display of static and dynamic 2D and 3D scenes [14][15][16] , in optical and optoelectronic information processing [19] , metrology [20] , interferometry [21] , microscopy [22] , and etc.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of quality of optical reconstruction of digital Fourier holograms displayed on phase-only SLM by its digital preprocessing

et al. 2014

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Digital holography is popular tool for research and practical applications in various fields of science and technology. Most widespread method of optical reconstruction implements digital hologram display on spatial light modulators (SLM). Optical reconstruction of digital holograms is used for remote display of static and dynamic 2D and 3D scenes, in optical information processing, metrology, interferometry, microscopy, etc. Holograms recorded with digital cameras are amplitude type. Therefore quality of its optical reconstruction with phase SLM is worse compared to amplitude SLM. However application of phase SLM can provide higher diffraction efficiency. To improve quality of optical reconstruction with phase SLM, method of SLM phase modulation depth reduction at digital hologram display is proposed. To our knowledge, this method was applied only in analog holography. Also two other methods of quality improvement are considered: hologram to kinoform conversion and holograms multiplexing. Numerical experiments on modelling of digital Fourier holograms recording and their optical reconstruction by phase SLM were performed. Method of SLM phase modulation depth reduction at digital holograms display was proposed and tested. SLM phase modulation depth ranged from 0 to 2π. Quantity of hologram phase levels equal to 256 corresponds to 2π phase modulation depth. To keep SLM settings while changing phase modulation depth hologram phase distribution was renormalized instead. Dependencies of reconstruction quality on hologram phase modulation depth were obtained. Best quality is achieved at 0.27π÷0.31π phase modulation depth. To reduce speckle noise, hologram multiplexing can be applied. Modeling of multiplex holograms optical reconstruction was conducted. Speckle noise reduction was achieved. For improvement of digital hologram optical reconstruction quality and diffraction efficiency hologram to kinoform conversion can be used. Firstly numerically reconstructed image of object was obtained. Then this image was used for kinoform synthesis. Diffraction efficiency was increased by 6.4 times in comparison with hologram reconstruction.

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Measurement of Modulation of the Phase Liquid-Crystal Light Modulator Santec SLM-200 and Analysis of Its Applicability for the Reconstruction of Images from Diffraction Elements

et al. 2021

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Numerical and optical reconstruction of digital off-axis Fresnel holograms

Cited by 15 publications

References 0 publications

Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications

Reduction of phase temporal fluctuations caused by digital voltage addressing in LC SLM "HoloEye PLUTO VIS" for holographic applications

Improvement of quality of optical reconstruction of digital Fourier holograms displayed on phase-only SLM by its digital preprocessing

Measurement of Modulation of the Phase Liquid-Crystal Light Modulator Santec SLM-200 and Analysis of Its Applicability for the Reconstruction of Images from Diffraction Elements

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