Improvement of the complex modulated characteristic of cascaded liquid crystal spatial light modulators by using a novel amplitude compensated technique

Hsieh, Mei Li; Chen, Mao Ling; Cheng, Chau Jern

doi:10.1117/1.2750658

Cited by 32 publications

(14 citation statements)

References 9 publications

(8 reference statements)

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“…Thus, we can use two SLMs, one in AM mode and the other one in PM mode, to control the amplitude and the phase of the light, respectively. This is what has been done in [22][23][24], but cascading the two SLMs demands precise alignment. Alternatively, H cp can be separated into two parts,…”

Section: A Complex Fresnel Hologrammentioning

confidence: 84%

“…Using two SLMs can display a complex hologram directly. This can be implemented by cascading two SLMs, one for amplitude modulation (AM) and the other for phase modulation (PM) [22][23][24]. Alternatively, a beam splitter can be applied to combine the beams from two SLMs, one for displaying the real part and the other the imaginary part of the complex hologram [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Complex Fresnel hologram display using a single SLM

et al. 2011

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We propose a novel optical method to display a complex Fresnel hologram using a single spatial light modulator (SLM). The method consists of a standard coherent image processing system with a sinusoidal grating at the Fourier plane. Two or three position-shifted amplitude holograms displayed at the input plane of the processing system can be coupled via the grating and will be precisely overlapped at the system's output plane. As a result, we can synthesize a complex hologram that is free of the twin image and the zero-order light using a single SLM. Because the twin image is not removed via filtering, the full bandwidth of the SLM can be utilized for displaying on-axis holograms. In addition, the degree of freedom of the synthesized complex hologram display can be extended by involving more than three amplitude holograms.

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Section: A Complex Fresnel Hologrammentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Complex Fresnel hologram display using a single SLM

et al. 2011

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“…The values of the constant coefficients 1 w to 4 w are set to the values adopted in [16], with 1 (4) to (7), we show, in Fig. 1(b), the spatial relation between pixel …”

Section: Basic Approach Based On Unidirectional Error Diffusionmentioning

confidence: 99%

“…One of the major problems is that high resolution devices that are capable of displaying holograms, such as Liquid Crystal on Silicon (LCoS), are only capable of displaying either the magnitude or the phase component of a complex hologram. A straightforward solution to this problem, is to employ two spatial light modulators (SLMs) to display the real and imaginary components, or the amplitude and phase information, of a complex hologram [3][4][5]. Likewise, a complex hologram can be simulated with a double phase-only hologram [6], and displayed with a pair of phase-only SLMs.…”

Section: Introductionmentioning

confidence: 99%

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Tsang¹,

Poon²

2013

Opt. Express

144

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Abstract:We report a novel and fast method for converting a digital, complex Fresnel hologram into a phase-only hologram. Briefly, the pixels in the complex hologram are scanned sequentially in a row by row manner. The odd and even rows are scanned from opposite directions, constituting to a bidirectional error diffusion process. The magnitude of each visited pixel is forced to be a constant value, while preserving the exact phase value. The resulting error is diffused to the neighboring pixels that have not been visited before. The resulting novel phase-only hologram is called the bidirectional error diffusion (BERD) hologram. The reconstructed image from the BERD hologram exhibits high fidelity as compared with those obtained with the original complex hologram.

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“…The use of two SLMs such as a cascaded configuration or a coherent addition enables the modulation of arbitrary complex amplitude [9][10][11][12][13]. These setups, however, require the precise alignment technique to adjust the pixel positions of each SLM.…”

Section: Introductionmentioning

confidence: 99%

Linear phase encoding for holographic data storage with a single phase-only spatial light modulator

Nobukawa

Nomura

2016

Appl. Opt.

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A linear phase encoding is presented for realizing a compact and simple holographic data storage system with a single spatial light modulator (SLM). This encoding method makes it possible to modulate a complex amplitude distribution with a single phase-only SLM in a holographic storage system. In addition, an undesired light due to the imperfection of an SLM can be removed by spatial frequency filtering with a Nyquist aperture. The linear phase encoding is introduced to coaxial holographic data storage. The generation of a signal beam using linear phase encoding is experimentally verified in an interferometer. In a coaxial holographic data storage system, single data recording, shift selectivity, and shift multiplexed recording are experimentally demonstrated.

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Improvement of the complex modulated characteristic of cascaded liquid crystal spatial light modulators by using a novel amplitude compensated technique

Cited by 32 publications

References 9 publications

Complex Fresnel hologram display using a single SLM

Complex Fresnel hologram display using a single SLM

Novel method for converting digital Fresnel hologram to phase-only hologram based on bidirectional error diffusion

Linear phase encoding for holographic data storage with a single phase-only spatial light modulator

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