Anamorphic and spatial frequency dependent phase modulation on liquid crystal displays. Optimization of the modulation diffraction efficiency

Márquez, Andrés; Iemmi, Claudio; Moreno, Ignacio; Campos, Juan; Yzuel, María Josefa

doi:10.1364/opex.13.002111

Cited by 37 publications

(26 citation statements)

References 16 publications

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“…In this paper we want to isolate as much as possible the flicker from other degradation effects which may be exhibited by SLMs. In this sense the anamorphic frequencydependent effect has been found both in transmissive LCDs [26] and in modern LCoS devices, both analog [27] and digitally [28] driven.…”

Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 88%

“…A diaphragm in front of the detector is needed to filter out any unwanted orders in the measurements. Vertical blazed gratings are addressed, i.e., the spatial frequency corresponds to rows/period, since along this direction potential deviations due to the anamorphic frequency-dependent effect [26][27][28] are less important. In this paper we want to isolate as much as possible the flicker from other degradation effects which may be exhibited by SLMs.…”

Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 99%

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Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

et al. 2015

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Parallel-aligned (PA) liquid-crystal on silicon (LCoS) microdisplays are especially appealing in a wide range of spatial light modulation applications since they enable phase-only operation. Recently we proposed a novel polarimetric method, based on Stokes polarimetry, enabling the characterization of their linear retardance and the magnitude of their associated phase fluctuations or flicker, exhibited by many LCoS devices. In this work we apply the calibrated values obtained with this technique to show their capability to predict the performance of spatially varying phase multilevel elements displayed onto the PA-LCoS device. Specifically we address a series of multilevel phase blazed gratings. We analyze both their average diffraction efficiency ("static" analysis) and its associated time fluctuation ("dynamic" analysis). Two different electrical configuration files with different degrees of flicker are applied in order to evaluate the actual influence of flicker on the expected performance of the diffractive optical elements addressed. We obtain a good agreement between simulation and experiment, thus demonstrating the predictive capability of the calibration provided by the average Stokes polarimetric technique. Additionally, it is obtained that for electrical configurations with less than 30°amplitude for the flicker retardance, they may not influence the performance of the blazed gratings. In general, we demonstrate that the influence of flicker greatly diminishes when the number of quantization levels in the optical element increases.

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Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 88%

Section: Numerical and Experimental Realization: Blazed Gratingsmentioning

confidence: 99%

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

et al. 2015

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“…the electrical signal is directly applied to the electrodes associated to a certain segment. This makes them a very useful device to proof the validity of models describing the electrooptic performance and the modulation capabilities of liquid crystal devices, also valid for high resolution LCDs, without additional effects due to the application of more complex video signals 14 . Second, the size of the segments is big enough so that we can analyze an individual segment with the unexpanded laser beam.…”

Section: Introductionmentioning

confidence: 93%

Low-cost liquid crystal display optimized as a monopixel coherent modulator

et al. 2007

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We propose the use of low cost alphanumeric liquid crystal displays (LCD) not only as an educational tool, to introduce students the insights of the electrooptic performance of liquid crystals, but also as a device able to be used in research to validate models describing the performance of LCDs and to be used in applications requiring monopixel optical modulation. High resolution LCDs have usually focused the research attention because of their capabilities to be used as SLMs. However low cost LCDs with a low number of pixels and directly addressed, such as segmented alphanumeric displays, may also be appealing devices. We show the characterization of one of the segments. The model applied had previously been demonstrated with high resolution LCDs, which are thin LCDs. The segmented LCD is found to be a thick LCD, thus, allowing us to verify the validity of the model in another range of conditions. Furthermore, we show that low cost alphanumeric LCDs can be used as monopixel LCDs. This is interesting since there are a number of applications, as in polarimetry or in interferometry, where monopixel LCDs may proof necessary. We optimize the modulation of the LCD both in the transmissive and in the reflective geometry to obtain amplitude-only and phase-only modulations which are useful for a number of applications.

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“…Notice that this particular device cannot modulate phase values between 1.6π and 2π. This drawback can be avoided using the saturation encoding technique proposed in [21] to compensate the diffraction efficiency loss.…”

Section: A Setting Up the Lcdmentioning

confidence: 99%

Design of Optical Systems With Extended Depth of Field: An Educational Approach to Wavefront Coding Techniques

2012

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A practical activity designed to introduce wavefront coding techniques as a method to extend the depth of field in optical systems is presented. The activity is suitable for advanced undergraduate students since it combines different topics in optical engineering such as optical system design, aberration theory, Fourier optics, and digital image processing. The paper provides theoretical background and technical information for performing the experiment. The proposed activity requires students able to develop a wide range of skills, since they are expected to deal with optical components, including spatial light modulators, and develop scripts to perform some calculations.

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Anamorphic and spatial frequency dependent phase modulation on liquid crystal displays. Optimization of the modulation diffraction efficiency

Cited by 37 publications

References 16 publications

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

Predictive capability of average Stokes polarimetry for simulation of phase multilevel elements onto LCoS devices

Low-cost liquid crystal display optimized as a monopixel coherent modulator

Design of Optical Systems With Extended Depth of Field: An Educational Approach to Wavefront Coding Techniques

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