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New paper in Optics & Lasers in Engineering with a geometric phase lens based system to analyze vector beams


VortexWe published a new paper in Optics & Lasers in Engineering entitled Geometrical-phase lens based optical system for the spin-splitting of vector beams

In this work we combine a geometric phase lens and a telescope system to produce an optical system with two polarization controlled real foci with equal magnification. And we apply it to characterize vortex beams and vector beams, splitting longitudinally the circular polarization components and focusing them into different axial planes.

This work was develop din collaboration with our friends Asticio Vargas and Fabián Torres-Ruiz, from Universidad de La Frontera, Temuco (Chile). And it is part of the PhD Thesis of Aarón Cofré.


Sábado, 14 de julio de 2018 Sin comentarios

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 in Applied Sciences about a zoom lens system without moving elements using SLMs


ZoomA new paper has been published entitled Programmable zoom lens system with two spatial light modulators: Limits imposed by the spatial resolution, published in the journal Applied Sciences, in a special issue devoted to liquid crystal on silicon devices.

This paper deals with the realization go a zoom lens system that used two liquid-crystal SLMs, so different magnifications can be obtained without any moving elements, simply by changing the focal length of the lenses displayed in each SLM. We include results with positive and negative magnifications. And we analyze the limits imposed by the limited spatial resolution of the SLMs.

The work has been developed at the Department of Physics at San Diego State University, with the participation of Ignacio Moreno.


Miércoles, 20 de junio de 2018 Sin comentarios

Prof. Glenn Boreman visits UMH and talks about how Photonics lights the world


2017 SPIE President Prof. Glenn Boreman has visited University Miguel Hernandez on May 21st, 2018, as part of his visit to Spain to participate at the events of the International Day of Light. Prof. Boreman is Chair of the Department of Physics and Optical Science at the University of North Carolina, Charlotte, and Director of the Center for Optoelectronics & Optical Communications.

He delivered the conference How Photonics lights the world at the Politechnical School of Elche, with great success of audience of professors and students. Below, with Augusto Beléndez (Univ. Alicante), Javier Alda (Univ. Complutense) and Inmaculada Pascual (Univ. Alicante). SPIE Women in Optics planners were handed in to the young attendees to promote optics and photonics.

Glenn Boreman


Categories: Conferences, Education, Outreach, Research Tags:

Sábado, 26 de mayo de 2018 Sin comentarios

Sirona Valdueza talks about ‘Women, Engineering and Research”


The presentation of Dr. Sirona Valdueza, researcher “Ramon y Cajal” at the Department of Electronics of University of Alcalá and former student of TecnOPTO is now available. This seminar was recorded on February 26th, 2018, in the Workshop “La Ciencia tiene nombre de mujer”


 


Categories: Education, Research, Women in Optics Tags:

Jueves, 10 de mayo de 2018 Sin comentarios

New paper in Optics & Laser Technology on the use of commercial q-plates at different wavelengths


S plateA new paper in the journal Optics & Laser Technology entitled Spectral performance of a zero-order liquid-crystal polymer commercial q-plate for the generation of vector beams at different wavelengths.

It deals with the use of liquid-crystal polymer q-plates operated at different wavelengths. We show how a broadband spectral characterization allows identifying the wavelengths with retardance values relevant for vector beam generation (ππ/2, and 3π/2). The wavelength is then used as a tuning parameter to change the device performance from the standard half-wave q-plate to a positive or a negative quarter-wave q-plate.

We present a simple procedure to derive the polarization distribution of the generated vector beams, and show that they can produce hybrid vector beams when operated at non-design wavelenths. Therefore, these results could extend the use of commercial q-plates for multicolour vector beam applications.

This work has been done in collaboration with Prof. Jeffrey A. Davis and Isaiah Abella, from San Diego State University.


 


Miércoles, 25 de abril de 2018 Sin comentarios

New paper in Optics & Lasers in Engineering with a self-calibration technique for a LCoS display


OLEA new paper published in Optics & Lasers in Engineering presents an experimental method to calibrate a liquid crystal on silicon (LCoS) display by using split-lens configurations displayed on the device. The split-lens directly generates an interference pattern from which the phase modulation is calculated. Additionally, a micro-lens array is displayed on the LCoS, within the same experimental set-up, to implement a Shack-Hartmann wavefront sensor and retrieve the display surface deformation.

This work is entitled LCoS display phase self-calibration method based on diffractive lens schemes, and has been developed by our collaborators at Universitat Autònoma de Barcelona, with the participation of Ignacio Moreno.


 


Domingo, 18 de marzo de 2018 Sin comentarios

Ignacio Moreno invited speaker at the AOIM XI workshop


AOIMIgnacio Moreno participated as invited speaker in the Workshop on Adaptive Optics for Industry and Medicine AOIM XI, organized by Pablo Artal and his group at the University of Murcia, in March 2018, 4-7.

Our latest results on the adaptive generation and detection of vector beams by means of liquid crystal spatial light modulators were presented in the talk entitled “Polarization Diffractive Elements displayed in Liquid Crystal Spatial Light Modulators”.

The workshop had very interesting talks, and a great ambience.

 


Categories: Conferences, International, Research Tags:

Lunes, 12 de marzo de 2018 Sin comentarios

New paper in Optics Express with a new technique to encode complex-valued holograms onto phase-only displays


ÑA new paper in Optics Express has been published entitled Random technique to encode complex valued holograms with on axis reconstruction onto phase-only displays, by José Luis Martínez-Fuentes and Ignacio Moreno.

This work presents a new technique to encode complex-valued holograms onto a phase-only display, based on a random selection determined by the amplitude level. The proposed technique offers some interesting features like on-axis hologram reconstruction, no iterative calculation, and good efficiency and good computational cost.

We provide here experimental results with computer generated holograms, as well as the generation of Hermite-Gauss and Laguerre-Gauss beams.


 

 


Categories: Publications, Research Tags:

Miércoles, 28 de febrero de 2018 Sin comentarios