Optimized Stokes polarimeters based on a single twisted nematic liquid-crystal device for the minimization of noise propagation

Peinado, Alba; Lizana, Ángel; Vidal, José Luis; Iemmi, Claudio; Campos, Juan

doi:10.1364/ao.50.005437

Cited by 30 publications

(23 citation statements)

References 20 publications

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“…For GLP, the N measurements are taken statically and simultaneously, hence the matrix A is stable and δA can be minimized. Then we can adopt a useful criterion named the condition number (CN) of a matrix [23][24][25], which has been widely used to estimate whether the instrument matrix A is "good" or not in both Stokes and Mueller polarimeters. The 2-norm CN of a matrix is the ratio of the largest singular value of the matrix to the smallest [25].…”

Section: Optimization Methods and Experimental Resultsmentioning

confidence: 99%

Optimization of GRIN lens Stokes polarimeter

Chang

et al. 2015

Appl. Opt.

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In a recent study we reported on the gradient index (GRIN) lens Stokes polarimeter (GLP) [Opt. Lett.39, 2656 (2014)10.1364/OL.39.002656OPLEDP0146-9592]. With a simple architecture, this polarimeter can measure the state of polarization in a single shot. In this article, we present further studies for improving the performance of the GLP. Detailed discussions are presented on the optimization process of the GLP based on different choices of data from the CCD images. It is pointed out that many optimization techniques, although developed for other types of Stokes polarimeters, can also be applied to the GLP because the GRIN lens can traverse all possible retardance and fast axis modulations.

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Section: Optimization Methods and Experimental Resultsmentioning

confidence: 99%

Optimization of GRIN lens Stokes polarimeter

Chang

et al. 2015

Appl. Opt.

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“…PA-LC cell acts as a linear retarder with variable retardance tunable with the applied voltage. Second, a polarimeter which uses a single twisted nematic LC (TN-LC), sketched in Fig.1(b) and analyzed in detail in [7]. TN-LC cell acts as an elliptical retarder, this enabling both introducing a retardance and rotating the polarization ellipse orientation.…”

Section: Comparative Of Polarimetersmentioning

confidence: 99%

Design of polarimeters based on liquid crystals and biaxial crystals for polarization metrology

Peinado¹,

Lizana²,

Campos³

2016

Opt. Pura Apl.

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ABSTRACT:This paper reviews three polarimeters based on different types of liquid crystal cells (parallel and twisted nematic, and ferroelectric), as well as a polarimeter based on the conical refraction phenomenon (occurring in biaxial crystals). A comparative analysis between them is included in order to summarize their main features and to point out their strengths and limitations. Then, the best candidate for imaging polarimetry is selected and implemented. Several polarization images are analyzed in order to show the potential of the instrument. Moreover, a new experimental configuration is presented, which combines an imaging polarimeter and a module used to achieve sub-pixelresolution in a system where the resolution is limited by detector pixel size. Experimental results show an improvement in the spatial resolution of polarization images by a factor of 1.4.Key words: polarimetry, liquid crystals, conical refraction, image polarimeter, super-resolution. RESUMEN:Este artículo revisa tres polarímetros basados en diferentes tipos de láminas de cristales líquidos (nemático con estructura paralela y helicoidal, y ferroeléctrico), así como un polarímetro basado en el fenómeno de la refracción cónica (que ocurre en cristales biaxiales). Se incluye un análisis comparativo entre ellos resumiendo sus principales características y señalando sus puntos fuertes y limitaciones. A continuación, se selecciona el mejor candidato para la polarimetría de imagen y es implementado. Se analizan varias imágenes de polarización con el fin de mostrar el potencial del instrumento. Además, se presenta una configuración experimental nueva, que combina un polarímetro de imagen y un módulo utilizado para lograr resolución sub-píxel en un sistema en el que la resolución está limitada por el tamaño del píxel del detector. Los resultados experimentales muestran una mejora en la resolución espacial de las imágenes de polarización en un factor de 1.4.Palabras clave: polarimetría, cristales líquidos, refracción cónica, polarímetro de imagen, superresolución. REFERENCES AND LINKS

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“…This method is used in [9,10] to optimize image parallel-aligned LCs-based polarimeters; also they conduct a thorough calibration to consider the dependence of the LC parameters with the angle of incidence of the light beam. Other polarimeter designs are based on twisted nematic (TN)-LCs [11,18]. In [18], complete Stokes polarimeters based on a single LC element (minimizing the number of LC panels in the setup) are implemented by taking advantage of the capability of those LCs to not only introduce a given retardance at the incident light beam but also to rotate its state of polarization.…”

Section: Introductionmentioning

confidence: 99%

“…Other polarimeter designs are based on twisted nematic (TN)-LCs [11,18]. In [18], complete Stokes polarimeters based on a single LC element (minimizing the number of LC panels in the setup) are implemented by taking advantage of the capability of those LCs to not only introduce a given retardance at the incident light beam but also to rotate its state of polarization. This single TN-LC-based polarimeter offers less light losses and reduces fabrication costs, but its optimization is limited by its characteristic curve.…”

Section: Introductionmentioning

confidence: 99%

Optimization and tolerance analysis of a polarimeter with ferroelectric liquid crystals

2013

Self Cite

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We present the design of Stokes and Mueller polarimeters based on ferroelectric liquid crystal (FLC) panels. The instrument is complete and takes time-sequential measurements. A FLC device is modeled as a uniaxial birefringent waveplate with two stable optical axis orientations switchable by a squared electrical signal. The optical parameters of the LC device (retardance and the two stable orientations of the fast axis) are calibrated. Then the orientations of the optical elements of the setup are optimized in order to minimize the propagation of the noise. We also provide a tolerance study to achieve 2% accuracy for the Stokes vector and Mueller matrix metrology. These analyses are conducted as a function of the incident state of polarization and of the Mueller matrix to be measured, respectively. The optimized system is implemented and calibrated in the laboratory. We evaluate its repeatability over 24 h of operation, and the dependence with the temperature is discussed. In addition, we include a study related to the speed of taking the measurements. Finally, we provide some experimental measurements of different Stokes vectors and Mueller matrices, validating the proposed prototypes.

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Optimized Stokes polarimeters based on a single twisted nematic liquid-crystal device for the minimization of noise propagation

Cited by 30 publications

References 20 publications

Optimization of GRIN lens Stokes polarimeter

Optimization of GRIN lens Stokes polarimeter

Design of polarimeters based on liquid crystals and biaxial crystals for polarization metrology

Optimization and tolerance analysis of a polarimeter with ferroelectric liquid crystals

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