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New paper in Optics Letters about a new technique of measuring the LCOS backplane deformation


INT1A new paper is available in Optics Letters entitled Measuring the spatial deformation of a liquid-crystal on silicon display with a self-interference effect.

Here we present a simple technique to characterize the spatial non-uniformity of a LCOS-SLM, based on illuminating the display with a wavelength out of the operation range. In this situation there is a significant reflection at the output surface and a Gires–Tournois type interferometer is directly created, without any alignment requirement and insensitive to vibrations. The beam reflected at the output surface is the reference beam, while the beam reflected at the silicon backplane is modulated with the addressed gray level in order to quantitatively derive its deformation. We provide an experimental demonstration using a LCOS-SLM designed to operate in the near-infrared range but illuminated with visible light.

This work is part of the PhD Thesis of David Marco and has been done in collaboration with our colleague Prof. Asticio Vargas, from Universidad de La Frontera, Temuco, Chile.


Viernes, 7 de agosto de 2020 Sin comentarios

FYLA interview with Ignacio Moreno


FYLA2FYLA is a young Spanish laser company. At TecnOPTO we have two of their supercontinuum lasers.

We use them i a variety of experiments that include the broadband characterization of optical retarders and iquid-crystal SLMs, and their use diffractive and optical information systems.

At the following link you can access the recent interview they made to Ignacio Moreno.

We thank Gaia Sardiello for her interview and collaboration.

 

 


Categories: Collaborators, Research Tags:

Viernes, 31 de julio de 2020 Sin comentarios

New paper in OSA Continuum about double ring interference with binary axicons


CbeltA new paper is available at OSA Continuum entitled Double-ring interference of binary diffractive axicons.

Here we report on the interference between the double rings generated by the Fourier transform of a binary diffractive axicon. These two rings have the same size and correspond to the +1 and -1 diffracted order beams. The interference condition between both rings can be easily changed by adding a constant phase bias. Additionally, this interference condition can be changed along the ring.

This work has been done in collaboration with our colleagues at San Diego State University Prof. Jeffrey A. Davis, Prof. Don M. Cottrell and Benjamin Gutierrez.


Lunes, 15 de junio de 2020 Sin comentarios

Open PhD student position available at TecnOPTO


We are looking for a MSc, preferably with experience in experimental optics and photonics, to develop a PhD Thesis in the field of optical polarimetry within a grant from the Valencian Government, Santiago Grisolía Program, ref. GRISOLIAP/2020/004.

Required conditions
– The candidate must hold a MSc degree in Physics, Electrical Engineering, Optics or related degree from a non-Spanish institution.
– The degree must have finished after January 1st 2016 and must qualify to enter a PhD program.
– Candidates must not hold a previous PhD degree (the selected candidate will have to enroll a UMH Doctorate Program when starting the contract.
– English language OR Spanish (Spanish language is NOT required).

Recommended experience:
– Work experience in experimental and instrumental optics.
– Computational skills (Matlab, C++ , Labview…)
– Fluent English written and spoken.

Job conditions:
– Period: Three years (renewable every year)
– Starting date: October 1st 2020
– Annual gross salary of 22,192.80 euros, plus 1,600 euros to cover travel expenses.
– Social security and institutional benefits included.

Interested candidates should submit their application by email before June 23, 2020, including a CV, the contact of two persons who can provide a recommendation letter, and one motivation letter stating the candidate’s interest in the project. Contact: i.moreno@umh.es


Lunes, 15 de junio de 2020 Sin comentarios

New paper in Applied Sciences about the generation of hybrid vector beams with a detuned q-plate


ASOur new paper is available in Applied Sciences, entitled Analysis of hybrid vector beams generated with a detuned q-plate. This article belongs to the journal special issue devoted to Ultrafast Vortex Pulses.

We use a tunable commercial liquid-crystal q-plate tuned to a quarter-wave retardance to study the generation and dynamics of different types of hybrid vector beams. Standard hybrid vector beams but also petal-like hybrid vector beams are generated. These beams are analyzed in the near field and compared with the far field distribution, where their hybrid nature is observed as a transformation of the intensity and polarization patterns.

The work has been developed during the stay in Elche last year of Julio César Quiceno, from Universidad del Valle, in Cali, Colombia.


Viernes, 15 de mayo de 2020 Sin comentarios

New paper in OSA Continuum showing Bessel beams with tunable control through maximum phase modulation


getThumbnail.cfmOur new publication is available in OSA Continuum Dynamic control of Bessel beams through high-phase diffractive axicon.

We present the realization of a high-phase diffractive axicon using a an SLM that exhibits 10π phase modulation. We compare the results with standard diffractive axicons with only 2π phase modulation. We show that high-phase modulation axicons generate Bessel beams with a shorter range and a smaller radius than standard axicons with the same period. We also find that the higher phase modulation regime provides improved diffraction efficiency since fringing effects are reduced. Dynamic control of Bessel beams is presented, controlled through the phase modulation dynamic range.

The paper has been done in collaboration with our friends at San Diego State University.


Categories: International, Projects, Research Tags:

Martes, 12 de mayo de 2020 Sin comentarios

Revista Española de Física highlights our technique to generate vector beams


REVRevista Española de Física, the journal of the Real Sociedad Española de Física – RSEF, highlights our technique presented in our recent paper in Optics and Lasers in Engineering.

A summary has been included in the section ‘Puntos de Interés» (link).

We thank Prof. Augusto Beléndez, Editor of REF for selecting our research for this section.


Sábado, 28 de marzo de 2020 Sin comentarios

TecnOPTO organizes a workshop on ‘Structured Light, Polarimetry and Imaging’


Workshop

On November 25th, 2019 we organized a workshop entitled ‘Structured Light, Polarimetry and Imaging‘.

The workshop was held at the Institute of Bioengineering of UMH, and we could count with the participation of experts from different groups in Spain working in these related fields. The program can be viewed at the following link.

We thank all the participants and attendees to this extremely interesting and motivating reunion.


Martes, 26 de noviembre de 2019 Sin comentarios

New paper in OLEN analyzing the diffraction efficiency of stepped gratings in large phase modulation SLMs


OLENOur new publication is available in Optics & Lasers in Engineering, entitled Diffraction efficiency of stepped gratings using high phase-modulation spatial light modulators.

We study the diffraction efficiency of linear phase (blazed) diffraction gratings displayed onto SLMs that exhibit a large phase modulation range, reaching a maximum phase modulation of 8pi or 10pi radians. We analyse these effects for their important implications in the Nyquist limit for diffractive elements

The paper has been done in collaboration with our friends at San Diego State University.


Domingo, 3 de noviembre de 2019 Sin comentarios

Visit of Dr. Tomás Belenguer from INTA


We had the pleasure to receive the visit of Dr. Tomás Belenguer Dávila, head of the Space Optical Instrumentation of INTA – Instituto Nacional de Técnica Aeroespacial.

The visit of Dr. Belenguer was part of hisp articipation in the TECNIT PhD Program Workshop, where he delivered a presentation about his activities, entitled Optical instrumentation in space missions. The presentation can be viewed at the following link:


Categories: Education, Outreach, Research Tags:

Martes, 15 de octubre de 2019 Sin comentarios