Self-addressed diffractive lens schemes for the characterization of LCoS displays

Ponència presentada a: Emerging Liquid Crystal Technologies (San Francisco, California: 13th, 27 January - 1 February 2018)We proposed a self-calibration method to calibrate both the phase-voltage look-up table and the screen phase distribution of Liquid Crystal on Silicon (LCoS) displays by implementing different lens configurations on the studied device within a same optical scheme. On the one hand, the phase-voltage relation is determined from interferometric measurements, which are obtained by addressing split-lens phase distributions on the LCoS display. On the other hand, the surface profile is retrieved by self-addressing a diffractive micro-lens array to the LCoS display, in a way that we configure a Shack-Hartmann wavefront sensor that self-determines the screen spatial variations. Moreover, both the phase-voltage response and the surface phase inhomogeneity of the LCoS are measured within the same experimental set-up, without the necessity of further adjustments. Experimental results prove the usefulness of the above-mentioned technique for LCoS displays characterization

XVI International Congress of Control Electronics and Telecommunications: "Techno-scientific considerations for a post-pandemic world intensive in knowledge, innovation and sustainable local development"

Este título, sugestivo por los impactos durante la situación de la Covid 19 en el mundo, y que en Colombia lastimosamente han sido muy críticos, permiten asumir la obligada superación de tensiones sociales, políticas, y económicas; pero sobre todo científicas y tecnológicas. Inicialmente, esto supone la existencia de una capacidad de la sociedad colombiana por recuperar su estado inicial después de que haya cesado la perturbación a la que fue sometida por la catastrófica pandemia, y superar ese anterior estado de cosas ya que se encontraban -y aún se encuentran- muchos problemas locales mal resueltos, medianamente resueltos, y muchos sin resolver: es decir, habrá que rediseñar y fortalecer una probada resiliencia social existente - producto del prolongado conflicto social colombiano superado parcialmente por un proceso de paz exitoso - desde la tecnociencia local; como lo indicaba Markus Brunnermeier - economista alemán y catedrático de economía de la Universidad de Princeton- en su libro The Resilient Society…La cuestión no es preveerlo todo sino poder reaccionar…aprender a recuperarse rápido.This title, suggestive of the impacts during the Covid 19 situation in the world, and which have unfortunately been very critical in Colombia, allows us to assume the obligatory overcoming of social, political, and economic tensions; but above all scientific and technological. Initially, this supposes the existence of a capacity of Colombian society to recover its initial state after the disturbance to which it was subjected by the catastrophic pandemic has ceased, and to overcome that previous state of affairs since it was found -and still is find - many local problems poorly resolved, moderately resolved, and many unresolved: that is, an existing social resilience test will have to be redesigned and strengthened - product of the prolonged Colombian social conflict partially overcome by a successful peace process - from local technoscience; As Markus Brunnermeier - German economist and professor of economics at Princeton University - indicates in his book The Resilient Society...The question is not to foresee everything but to be able to react...learn to recover quickly.Bogot

LCoS display phase self-calibration method based on diffractive lens schemes

An experimental method to calibrate Liquid Crystal on Silicon (LCoS) displays by self-generating lens configurations on the studied device is proposed in this paper. On the one hand, a split-lens is displayed in the LCoS to self-generate an interference pattern from which the phase-voltage curve of the modulator is calculated. On the other hand, a microlens array is displayed on the LCoS, within a same experimental set-up, to implement a Shack-Hartmann (S-H) wavefront sensor, from which the display surface profile is retrieved. Specifically, by means of a feasible set-up, the proposed method allows measuring the deviation from flatness of the LCoS displays as well as to determine the phase-voltage response of phase-only SLMs. Experimental results demonstrate a linear tendency phase-voltage curve that ranges from 0 rad up to ∼6.28 rad, for the used light wavelength. Moreover, by extracting the LCoS phase distribution measured with the S-H configuration, the LCoS surface inhomogeneity is corrected by 95%.H. Zhang acknowledges the financial support of the Chinese Scholarship Council (CSC) (No. 201504910783). H. Zhang, A. Lizana and J. Campos acknowledge the financial support of Spanish MINECO (FIS2015-66328-C3-1-R and fondos FEDER); Catalan Government (SGR 2014-1639). C. Iemmi acknowledges the financial support of UBACyT20020130100727BA, CONICET PIP 11220150100475CO, and ANPCYT PICT 2014/2432

Wavefront imaging by using an inline holographic microscopy system based on a double-sideband filter

In this letter, we propose an inline holographic microscopy (ILHM) system, based on the double-sideband technique (DST), for wavefront imaging. The presented optical system shows all the benefits of the previously reported DST (instantaneous removing of ghost images in an inline scheme) but adapted to a microscopic system. The double-sideband filter is implemented by using a transparent liquid crystal (LC) bi-pixel device. Specifically, by addressing the proper phase values to each half of the LC bi-panel, which is located at the Fourier plane of the holographic system, the conjugate image is removed. What is more, by using a high numerical aperture microscope objective, we achieved the microscopic wavefront holography imaging. Finally, the feasibility of the proposed system is testified by obtaining holographic wavefront images of different objects.Fil: Zhang, Haolin. Universidad Autonoma de Barcelona. Facultad de Física; EspañaFil: Monroy Ramírez, Freddy A.. Universidad Nacional de Colombia; ColombiaFil: Lizana, Ángel. Universidad Autonoma de Barcelona. Facultad de Física; EspañaFil: Iemmi, Claudio César. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria; ArgentinaFil: Bennis, Noureddine. Military University Of Technology; PoloniaFil: Morawiak, Przemysław. Military University Of Technology; PoloniaFil: Piecek, Wiktor. Military University Of Technology; PoloniaFil: Campos, Juan. Universidad Autonoma de Barcelona. Facultad de Física; Españ

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Ponència presentada a: Emerging Liquid Crystal Technologies (San Francisco, California: 13th, 27 January - 1 February 2018)We proposed a self-calibration method to calibrate both the phase-voltage look-up table and the screen phase distribution of Liquid Crystal on Silicon (LCoS) displays by implementing different lens configurations on the studied device within a same optical scheme. On the one hand, the phase-voltage relation is determined from interferometric measurements, which are obtained by addressing split-lens phase distributions on the LCoS display. On the other hand, the surface profile is retrieved by self-addressing a diffractive micro-lens array to the LCoS display, in a way that we configure a Shack-Hartmann wavefront sensor that self-determines the screen spatial variations. Moreover, both the phase-voltage response and the surface phase inhomogeneity of the LCoS are measured within the same experimental set-up, without the necessity of further adjustments. Experimental results prove the usefulness of the above-mentioned technique for LCoS displays characterization

Desarrollo de aplicaciones de la holografía para la industria y la cultura

IP 2228-05-401-92ARTICULO(S) EN REVISTA: Selective properties of reflectionsingle and multicolor holograms / A. I Khizhnyak,;V. B Markov - En: Revista Colombiana de Fisica No 28 (1996); p.35-46 - Correlation analysis of;pseudo-identical structures for pattern recognition / Yobani Mejia, Vladimir Markov, Roman Castañeda - En:;Revista Colombiana de Fisica No 29 (1997); p. 45-58 - Experimental RCP testing / Pierre M. Bonne, Vladimir;Markov, Philippe Vanspeybroeck - En: optics and lasers inengineering No 24 (1996); p. 215-229 - Correlation;analysis of pseudo-identical structures for pattern recognition/ VladimirB. Markov, Yobani Mejia - En:;Spie-the international society for optical engineering vol. 2659(1996 : feb. 1-2); p. 187-195 - Selective;characteristics of single layer color holograms / VladimirMarkov, A. I Khizhnyak - En: Spie-the intentional;society for optical engineering vol. 2652 (1996); p. 304-0-11Spatial-angular selectivity of 3-d speckle-wave;holograms and information storage / Vladimir B. Markov - En: Journal of imaging science and technology vol. 41;No 4 (1997 : July-august); p.383-388 - Coherent-optical localisation and assessment of importance of damage;and defects of cultural heritage / Pierre M. Boone, Vladimir B.Markov, Nicola M. Burkina, Adam V. Ovsyannikov;- En: Nid and E. International vol. 30 No 2 (1997); p. 61--67Analysis ofa quasi-periodical structure;through its autocorrelation function / Yobani Mejia, VladimirB.Markov, Roman Castañeda - En: Optical;Engineering vol. 35 No 10 (1996 : oct); p. 2845-2851 - ISSN 00913286 - Selective proper of reflection single;and multicolor holograms / A. I Khizhnyak, Vladimir B. Markov-En: Revista Colombiana de Fisica No 28 (1996);p. 35-46 - Display and applied holography in museum practice /Vladimir B.Markov - En: Optics y laser;technology vol. 28 No 4 (1996); p. 319-325 - Examination of museum objectsby video holography / Pierre M.;Boone, Vladimir B. Markov - En: The journal of the internationalinstitutefor conservation of historic and;artistic works vol. 40 No 2 (1995 : may); p. 103-109 - 3-DSpeckle shift hologram and its storage capacity /;Vladimir B. Markov, Yuri N. Denisyuk, Ricardo Amezquita -En:Optical Memory and Neural Networks vol. 6 No 2;(1997); p. 91-98 - CAPITULO(S) EN LIBRO: Holography by video means used for museum objects diagnostic / Pierre;M. Boone, Vladimir B. Markov. - p. 11-17. - En: Non destructivetesting, hemelrijck y anastassopoulos (EDS);Balkema, Rotterdam - 1996 - il. ; 29 cm. - ISBN 905410595X -