Measurement of the phase modulation in liquid crystal television based on the fractional‐Talbot effect

Serrano-Heredia, Alfonso; Lu, Guoqiang; Purwosumarto, Purwadi; Yu, Francis T. S.

doi:10.1117/1.600834

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…The curve was constructed by experimental measurement of the transmitted intensity and the phase introduced by the LCoS. To measure the phase, we used a technique based on the fractional Talbot effect [17], [24,25]. In short, we Fig.…”

Section: Optimization Of the Lcos Phase Modulation Responsementioning

confidence: 99%

Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal-on-silicon display

Clemente¹,

Durán²,

Martínez-León³

et al. 2008

Opt. Express

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Abstract:We provide experimental measurement of the Mueller matrices corresponding to an on-state liquid-crystal-on-silicon display as a function of the addressed voltage. The polar decomposition of the Mueller matrices determines the polarization properties of the device in terms of a diattenuation, a retardance and a depolarization effect. Although the diattenuation effect is shown to be negligible for the display, the behavior of the degree of polarization as a function of the input polarization state shows a maximum coupling of linearly polarized light into unpolarized light of about 10%. Concerning the retardation effect, we find that the display behaves as a retarder with a fast-axis orientation and a retardance angle that are voltage-dependent. The above decomposition provides a convenient framework to optimize the optical response of the display for achieving a phase-mostly modulation regime. To this end, the display is sandwiched between a polarization state generator and a polarization state analyzer. Laboratory results for a commercial panel show a phase modulation depth of 360º at 633 nm with a residual intensity variation lower than 6 %.

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Section: Optimization Of the Lcos Phase Modulation Responsementioning

confidence: 99%

Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal-on-silicon display

Clemente¹,

Durán²,

Martínez-León³

et al. 2008

Opt. Express

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“…The Stokes parameters ) , , ( ' were experimentally measured. In order to measure the LCoS phase modulation for the optimal configurations we use the fractional-Talbot effect [6,22]. With the LCoS display, we implement different binary gratings where one gray level is fixed and the other is variable.…”

Section: Resultsmentioning

confidence: 99%

Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulators

Durán

Clemente

Martínez-León

et al. 2009

J. Opt. A: Pure Appl. Opt.

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We establish necessary conditions in order to design a phase-only wave front modulation system from a liquid crystal display. These conditions determine the dependence of the polarization state of the light emerging from the display on the addressing gray level. The analysis, which is carried out by means of the coherence-matrix formalism, includes the depolarization properties of the device. Two different types of polarization distributions at the output of the liquid crystal cells are found. This approach is applied to a twisted nematic liquid crystal display. In this case, an optimization algorithm must be designed in order to select the input polarization state that leads to the required distributions.We show that the Poincaré-sphere representation provides a convenient framework to design the optimization algorithm as it allows for a reduced number of degrees of freedom. This feature significantly decreases the computation time. Laboratory results are presented for a liquid crystal-onsilicon display showing a phase modulation depth greater than 2π radians with an intensity variation lower than 6%. In addition, a hybrid-ternary modulation (HTM), an operation regime employed in holographic data storage, is achieved.

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“…The phase modulation can be obtained from the relative intensities of these two di raction orders. Other di raction techniques have been proposed to measure the phase modulation [17,18].…”

Section: Introductionmentioning

confidence: 99%

Full in-situ characterization of spatial light modulators in an optical correlator. Filter adaptation to operating curves

López‐Coronado¹,

Moreno²,

Campos³

et al. 1998

Journal of Modern Optics

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Fu ll in -situ c h arac te r iz ation of spatial ligh t m od u lators in an optic al c orre lator. Filte r ad aptation to ope ratin g c u rv e s Abs trac t.In this paper we present one method for the characterization of the spatial light modulators (SLMs) of a real-time Vander Lugt type of correlator. This correlator uses two SLMs: one to introduce the scene and a second to introduce the frequency-matched ® lter. The SLM characterization methods are in situ, that is in the correlator set-up. Illumination conditions are di erent for each SLM, and consequently di erent characterization techniques must be used in each case. For the characterization of the scene SLM a di raction method is used, while for the characterization of the ® lter SLM an interferometric technique is more convenient. Finally, we take into account the operating curves of scene and ® lter SLMs in the design of the ® lter in order to optimize the correlation peak.

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Measurement of the phase modulation in liquid crystal television based on the fractional‐Talbot effect

Cited by 12 publications

References 18 publications

Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal-on-silicon display

Use of polar decomposition of Mueller matrices for optimizing the phase response of a liquid-crystal-on-silicon display

Poincaré-sphere representation of phase-mostly twisted nematic liquid crystal spatial light modulators

Full in-situ characterization of spatial light modulators in an optical correlator. Filter adaptation to operating curves

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