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New paper in European Journal of Physics about vortex beams with a TNLC-SLM


ejpWe published a new paper in European Journal of Physics entitled Vortex beam generation and other advanced optics experiments reproduced with a twisted-nematic liquid-crystal display with limited phase modulation.

In this work we propose the use of twisted-nematic liquid-crystal spatial light modulators (TN-LC-SLM) as a useful tool for training students in the manipulation of light beams with phase-only masks. In particular, we focus the work on the realization of phase-only gratings and phase-only spiral phases for the generation of vortex beams, beams carrying orbital angular momentum (OAM). We include different examples, including a optimal triplicator phase grating, and its combination with spiral phase patterns and lens functions to generate a variety of vortex beams.

The paper is included in a special section of the journal devoted to “Advanced Optics”, and it is the first publication from the PhD Thesis of Aarón Cofré.


Categories: Education, International, Publications Tags:

Miércoles, 14 de diciembre de 2016 Sin comentarios

Ignacio Moreno awarded as 2017 OSA Fellow


osa-fellowIgnacio Moreno has been awarded as a new 2017 OSA Fellow Member. This distinction was awarded to 96 OSA members for their significant contributions to the advancement of optics and photonics. The selection of these candidates was confirmed by the Board of Directors at its meeting in October 2016.

Ignacio Moreno has been recognized for his achievements on the control over amplitude, phase, polarization and wavelength with diffractive optical elements encoded onto liquid crystal displays.

The complete list of new awarded Fellows can be found at: link


Categories: International, Research Tags:

Viernes, 18 de noviembre de 2016 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

New paper in JJAP demonstrating the parallel generation of different vector beams


jjapWe published a new paper in Japanese Journal of Applied Physics entitled Parallel generation of multiple first-order vector beams with a polarization grating and a q-plate device.

In this work we demonstrated the parallel generation of multiple vector beams by combining a polarization diffraction grating with a q-plate element.

This work was made with our friends at San Diego State University (US), and in collaboration with our colleagues at the Development Division of Citizen Holdings Co (Japan).


Miércoles, 9 de noviembre de 2016 Sin comentarios

TecnOpto selected as finalist of the Edmund Optics 2016 Educational Award


edu-16-sheildTecnOpto was selected as a finalist of the 2016 Educational Award of the company Edmund Optics.

The selection was made on the basis of a proposed project of building a programmable optical microscope with different Fourier transform filtering operations performed in real time from a computer with a LCoS display. This way we are able to reproduce classical and novel microscopy techniques without moving elements in the optical system.

The complete list of winners and finalists can be found in: link

 


Categories: Education, International, Outreach Tags:

Lunes, 7 de noviembre de 2016 Sin comentarios

Ignacio Moreno attends the 6th Workshop LCP in Ljubljana


lcp-ljbljanaIgnacio Moreno attended the 6th International Workshop on Liquid Crystals for Photonics – WLCP2016, that was held in Ljubljana (Slovenia) from September 14th to 16th.

In this workshop he gave an invited talk entitled “Liquid-crystal spatial light modulator based optical ac¡architecture for the full polarization modulation – Application to encode optical polarization devices”.

The LCP workshop is always particularly friendly to attend, after our organization in 2010 in Elche.

The picture shows Ignacio with our friends Juan Campos and Angel Lizana, from Autonomous University of Barcelona, who also attended the conference.

 


Categories: Conferences, International Tags:

Viernes, 30 de septiembre de 2016 Sin comentarios

Asticio Vargas visits TecnOPTO Lab


Asticio VargasIn June 2016 we received the visit of our friend Dr. Asticio Vargas, from the Department of Physical Sciences, at Universidad de La Frontera, in Temuco, Chile.

Asticio stayed for three weeks in our lab, where we have been working hard on different projects related to Solc filters and polarization.

The picture shows from right to left Asticio, with Ignacio, and two of the current PhD students, Abdelghafor Messaddi, from Algeria, and  Aaron Cofré, also from Chile.


Categories: Collaborators, International Tags:

Martes, 28 de junio de 2016 Sin comentarios

New paper in Optics Letters about the production of non-diffracting vector beams


Vector beamsWe published a new paper in Optics Letters, entitled Nondiffracting vector beams where the charge and the polarization state vary with propagation distance. The paper appeared published in the OL issue of May 2016.

In this work we  generate nondiffracting vector beams where the charge and the polarization state vary with the propagation distance. We use reflective geometry where a parallel-aligned spatial light modulator is used to spatially modulate two orthogonal linear polarizations. We encode spiral phases with equal charge but with opposite signs onto the two polarization directions to encode a vector beam and add two axicon phases. Both the charge and the phase shift between the two axicons can be varied along the focus line.

This work has been done in collaboration with our friends at San Diego State University, and was designed during the recent visit of Ignacio Moreno to SDSU in February 2016.


Categories: International, Publications Tags:

Miércoles, 18 de mayo de 2016 Sin comentarios

New paper in Optical Engineering, with a q-plate operating at the 1550 nm telecom wavelength


1550 nm peakWe published a new paper in Optical Engineering Letters, entitled Generation of vector beams at 1550 nm telecommunications wavelength using a segmented q-plate. The paper appeared published in the third issue of OE journal in 2016.

In this work we present the use of a q-plate device operating at the 1550 nm telecommunications wavelength. A prototype liquid-crystal device from Citizen Holdings Co. is demonstrated to be useful for the generation of vector beams and orbital angular momentum transfer at this important wavelength.

The device was developed for a visible wavelength, but we show here that it can be applied also for the 1550 nm wavelength, where is of interest to apply such devices to multiplex data with OAM channels.

This work was initiated during the stay of María M. Sanchez-López and Ignacio Moreno at SDSU during Summer 2015.


Categories: International, Publications Tags:

Sábado, 9 de abril de 2016 Sin comentarios

Ignacio Moreno presents an invited conference at SPIE Photonics Europe 2016


epeIgnacio Moreno presents an invited communication at the meeting SPIE Photonics Europe held in Brussels in April 2016.

The communication is entitled “Production of arbitrary polarized light beams with a liquid crystal spatial modulator”, and it was presented within the session Optical Micro- and Nanometrology. This communication reviews our recent advances in the design of polarization diffractive optical elements encoded onto a spatial light modulador system.


Categories: Conferences, International, Publications Tags:

Sábado, 9 de abril de 2016 Sin comentarios