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Aarón Cofré presents his PhD Thesis on diffractive optics systems for the generation of optical vortices and structured polarized beams


AaronOn July 10th 2018, Aarón Cofré presented the defense of his PhD Thesis entitled Development of advanced diffractive systems for the generation of optical vortices and structured polarized beams.

The Thesis has been supervised by Ignacio Moreno and Asticio Vargas, and included various experimental studies on how to generate optical vortices and vector beams.

The results of the thesis resulted in four articles published in the journals European Journal of Physics, Optics & Lasers Technology, Optics Express and Optics & Lasers in Engineering respectively.

In the picture, Aarón with the supervisors and the members of the jury.

 

 

 


Miércoles, 11 de julio de 2018 Sin comentarios

Santiago López presents his Final Degree Project for Telecommunications Degree on a system to generate phase-only holograms with new high resolution displays


SantiagoOn July 9th, 2018, Santiago López, student of the Grade of Telecommunications Engineering, defended his final degree project entitled Caracterización de moduladores de cristal líquido para la generación de hologramas de fase y su optimización.

In this work, Santiago developed a characterization of the phase properties of some new displays acquired at the TecnOPTO Lab, and developed new methods and designs to generate phase-only holograms with them.

The project, supervised by Ignacio Moreno, received the maximum qualification


Categories: Education, Projects, Research, Students Tags:

Martes, 10 de julio de 2018 Sin comentarios

New paper on Optics Letters with a design for an achromatic retarder system with tunable retardance


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We published a new paper in Optics Letters entitled Achromatic linear retarder with tunable retardance.

In this work we present a universal design and proof-of-concept of a tunable linear retarder of uniform wavelength response in a broad spectral range. It consists of two half-wave retarders (HWR) between two quarter-wave retarders (QWRs), where the uniform retardance can be tuned continuously by simply rotating one of the HWRs. A proof-of-concept of this design is built by using commercially available Fresnel rhomb retarders that provide retardation with almost wavelength uniformity in the visible and near infrared from 450 to 1550 nm. The system is experimentally demonstrated to control the state of polarization of a super-continuum laser.

The work has been developed in collaboration with Asticio Vargas, from Universidad de la Frontera, Chile. And it is part of the PhD thesis of Abdelghafour Messaadi.


Sábado, 7 de julio de 2018 Sin comentarios

Our former student Venancio Calero presents his PhD Thesis at FEMTO-ST Institute


VenancioOur former student Venacio Calero, presented his PhD Thesis entitled “Antenne à cristal photonique électro-optique pour la détection de fréquences électromagnétiques”, supervised by María Pilar Bernal and Nadège Courjal at the FEMTO-ST Institute, in Besançon (France), on December 19th, 2017.

Ignacio Moreno attended the defense and participated as a member of the jury.


 

 


Viernes, 5 de enero de 2018 Sin comentarios

New paper in Optics Express about dual polarization split lenses


OptExpressWe published a new paper in Optics Express where we report the realization of polarization sensitive split lens configurations. We propose and demonstrate the generalization of the split lens concept to vectorial split lenses, leading to light patterns with customized intensity and state of polarization. We demonstrate how these polarization split lenses can be experimentally implemented by means of an optical system using two liquid crystal spatial light modulators, each one phase modulating one orthogonal polarization component.

The proposed technique is a simple method to generate structured light beams with polarization diversity, with potential applications in polarimetry, customized illuminators or quantum optics.

This work has been published in Optics Express, entitled Dual polarization split lenses. The work has been developed in collaboration with our friends at the Departamento de Ciencias Físicas, Universidad de la Frontera (Chile) and our friends at Departamento de Física de la Universitat Autònoma de Barcelona. This is the third paper resulting from the Thesis of the PhD student Aarón Cofré.


 


Martes, 19 de septiembre de 2017 Sin comentarios

Marcos Maestre presents his Final Degree Project on a system to control light pulses and measure slow and fast light


IMG_7139On Friday July 7th, Marcos Maestre, student of Telecommunications Engineering, has defended his Final Degree Project entitled “Control de Pulsos Ópticos en Fibra y Medida de Efectos de Luz Lenta y Luz Rápida en Interferómetros“.

In this work, an instrumental system and its control software has been developed in order to characterize electro-optical modulators and polarization interferometers based on birefringent fibers. Using this setup slow and fast light (SFL) effects have been demonstrated for optical pulses centered at 1550 nm.

The project, which has been supervised by Julia Arias and María del Mar Sánchez-López, has obtained the maximum qualification, with honours.

A related communication will be presented at OPTOEL2017 – the Spanish Meeting on Optoelectronics.


Categories: Education, Research, Students Tags:

Domingo, 23 de julio de 2017 Sin comentarios

New paper in JEOS-Rapid Pub with an optical system to characterize retarders in a wide spectral range


jeosWe published a new paper in Journal of the European Optical Society – Rapid Publications, entitled Optical system for measuring the spectral retardance function in a extended range.

Here we apply a well-known technique for determining the spectral retardance of different linear retarders by measuring the transmission spectra between crossed or parallel polarizers. The system we developed allows measurements in a wide spectral range covering the visible (VIS) and near infrared (NIR) spectrum in the range from 400 to 1600 nm.

This work was made in collaboration with our friend Asticio Vargas from UFRO (Chile), and it is the first paper of the PhD thesis of Abdelghafor Messaadi.


Categories: International, Publications, Students Tags:

Lunes, 14 de noviembre de 2016 Sin comentarios

Pedro Martínez and Jordi Gomis successfully defend their Master degree thesis on the development of a digital spectrum generator


Pedro y JordiMaster students Pedro Martínez and Jordi Gomis successfully defended their respective Master degree thesis on March 3rd 2016, to obtain the Master degree in Solar & Renewable Energy from UMH.

They both developed their master thesis within TecnOpto Lab, supervised by Ignacio Moreno, in the development of a spectral control system based on a super continuum laser source modulated by means of a liquid crystal spatial light modulator. They both received the maximum grade for their work.

Pedro’s work was entitled “Study of liquid crystal modulators for the realization of a digital artificial and solar spectrum generator”, while Jordi’s work was entitled “Advanced optical system for the generation of digital spectra. Application as a solar simulator and source for testing detectors”.

 

 

 


Categories: Students, Thesis Tags:

Sábado, 12 de marzo de 2016 Sin comentarios

Venancio Calero and Cristian Santiago succesfully present their Final Degree Thesis


Photo SmallVenancio Calero and Cristian Santiago succesfully defended their final degree Thesis in Telecommunications Engineering and in Industrial Engienering respectively, both supervised by Ignacio Moreno.

Venancio completed a work entitled “Liquid crystal spatial light modulators with high phase modulation for controlling a laser deflector”, where he applied a LCoS device designed to operate with IR light to achieve large values of phase modulation with visible light. The picture shows Venancio and Ignacio at the end of the session.

Cristian  completed a work entitled “Realization of a Fourier transform optical processing system based on LCoS modulators”, where he built an optical image processor system and applied different optical techniques.


Categories: Students, Thesis Tags:

Martes, 11 de noviembre de 2014 Sin comentarios