A5006782816- Adaptive optics and wavefront sensing
- Optical Wireless Communication Technologies
- Advanced optical system design
- Optical Systems and Laser Technology
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Optical measurement and interference techniques
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- solar cell performance optimization
- Advanced Vision and Imaging
- Semiconductor Lasers and Optical Devices
- Ionosphere and magnetosphere dynamics
- Orbital Angular Momentum in Optics
- Planetary Science and Exploration
- Optical Coherence Tomography Applications
- Advanced Optical Imaging Technologies
- Astronomical Observations and Instrumentation
- Geophysics and Sensor Technology
- Spectroscopy and Laser Applications
- Image Processing Techniques and Applications
- Advanced Frequency and Time Standards
- Photorefractive and Nonlinear Optics
- Material Properties and Processing
- Statistical and numerical algorithms
Instituto de Astrofísica de Canarias
2013-2024
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2023
Universidad de La Laguna
2015
Consejo Superior de Investigaciones Científicas
2010-2014
Delft University of Technology
2001-2006
Royal Observatory
2006
UK Astronomy Technology Centre
2006
The paper describes the operations of ESA's Optical Ground Station (OGS) during Lunar Laser Communications Demonstration (LLCD) experiment, performed in October and November 2013 with NASA's Atmospheric Dust Environmental Explorer (LADEE) spacecraft. First transmitter receiver designs at OGS telescope are described, which geometrically separated to prevent cross-talk. Problems encountered lesson learned will be explained. As it turned chosen arrangement was not sufficiently stable terms...
We report on the comparison between observations and simulations of a completed 12-month field observation campaign at Observatorio del Teide, Tenerife, using ESO's transportable 20 watt CW <i>Wendelstein </i>laser guide star system. This mission has provided sodium photon return flux measurements unprecedented detail regarding variation laser power, polarization D<sub>2b</sub> repumping. The Raman fiber projector technology are very similar to that employed in 4LGSF/AOF facility, recently...
The Adaptive Optics (AO) of the Gran Telescopio Canarias (GTC) is a single conjugate postfocal system, integrated in one Nasmyth platforms telescope. GTC located Observatory Roque de Los Muchachos (ORM) island La Palma, Spain. GTCAO based on deformable mirror (DM) with 373 actuators, conjugated to pupil, and Shack-Hartmann wavefront sensor (WFS) 312 useful sub-apertures an OCAM2 camera. performance required for 65% Strehl Ratio K-band under average atmospheric conditions bright NGS. After...
The CAFADIS camera is a new wavefront sensor (WFS) patented by the Universidad de La Laguna. system based on concept of plenoptic originally proposed Adelson and Wang [Single lens stereo with camera, IEEE Transactions Pattern Analysis Machine Intelligence 14 (1992)] its most salient feature ability to simultaneously measuring maps distances objects [Wavefront distance measurements using in Astronomical telescopes, Marseille (2008)]. This makes an interesting alternative for LGS-based AO...
The plenoptic camera has been proposed as an alternative wavefront sensor adequate for extended objects within the context of design European Solar Telescope (EST), but it can also be used with point sources. Originated in field Electronic Photography, directly samples Light Field function, which is four - dimensional representation all light entering a camera. Image formation then seen result photography operator applied to this and many other features exploited extract information scene,...
Multi-Conjugate Adaptive Optics (MCAO) will play a key role in future astronomy. Every Extremely Large Telescope (ELT) is being designed with its MCAO module, and most of their instruments rely on that kind correction for optimum performance. Many technical challenges have to be solved order develop systems. One them, related use ELT's, find fast algorithms perform the reconstruction at required speed. For reason we been studying application Fourier Transform Reconstructor (FTR) MCAO. We...
The European Solar Telescope (EST) will be a new generation telescope with the challenge of achieving corrected field view (FOV) 1 arcminute minimum Strehl 40% in whole range elevation angles observation. For this purpose EST equipped MCAO (Multi- conjugate Adaptive Optics) system. proposed system for telescopes combines narrow and wide extended Shack Hartman (SH) wavefront sensors (WFS) taking as references spot or granulation sun. number position deformable mirrors (DMs), (FOV), asterism...
Extremely Large Telescopes (ELTs) are very challenging with respect to their adaptive optics (AO) requirements. Their diameters and the specifications required by astronomical science for which they being designed imply a huge increment in number of degrees freedom deformable mirrors. Faster algorithms needed implement real-time reconstruction control AO at speed. We present results study correction performance three different applied case 42-m ELT: one considered as reference, matrix-vector...
The European Solar Telescope (EST) is a 4-meter facility to be built in Canary Islands the near future. Extensive daytime turbulence observation campaigns with long baseline SHABAR instrument has been carried out two candidate sites from 2011 up end of 2014. collected data together nighttime allow site characterization and computation average profiles. These profiles can used feed numerical simulations order take important design decisions for multiconjugate adaptive optics (MCAO) system...
First on sky adaptive optics experiments were performed the Dunn Solar Telescope 1979, with a shearing interferometer and limited success. Those early solar efforts forced to custom-develop many components, such as Deformable Mirrors WaveFront Sensors, which not available at that time. Later on, development of correlation Shack-Hartmann marked breakthrough in optics. Since then, successful Single Conjugate Adaptive Optics instruments have been developed for telescopes, i.e. National...
The Adaptive Optics system of the 10-m class Gran Telescopio Canarias (GTCAO) is completing acceptance tests in laboratory at Instituto de Astrofísica Canarias, to be ready for its integration telescope Roque Los Muchachos Observatory (ORM) 2023. AO has been designed with robustness and operability as key characteristics, will a facility GTC. It features single deformable mirror (DM) 373 actuators, conjugated pupil, Shack-Hartmann wavefront sensor (WFS) 312 subapertures, using an OCAM2...
The European Solar Telescope (EST) is a 4.2-m telescope which has been redesigned with fully integrated Multi-Conjugate Adaptive Optics (MCAO) into the optical path right after EST primary mirror. current baseline configuration considers four altitude Deformable Mirrors (DM) conjugated to 5, 9, 12 and 20 km above entrance pupil an Secondary Mirror (ASM) pupil. wavefront sensing will be performed by set of correlation-based Shack Hartmann sensors (WFS) combining on-axis High-Order WFS (HOWFS)...
Plenoptic cameras have been developed the last years as a passive method for 3d scanning, allowing focal stack capture from single shot. But data recorded by this kind of sensors can also be used to extract wavefront phases associated atmospheric turbulence in an astronomical observation. The terrestrial atmosphere degrades telescope images due diffraction index changes turbulence. Na artificial Laser Guide Stars (Na-LGS, 90km high) must obtain reference phase and Optical Transfer Function...
Plenoptic cameras have been developed over the last years as a passive method for 3d scanning. Several superresolution algorithms proposed in order to increase resolution decrease associated with lightfield acquisition microlenses array. A number of multiview stereo also applied extract depth information from plenoptic frames. Real time systems implemented using specialized hardware Graphical Processing Units (GPUs) and Field Programmable Gates Arrays (FPGAs). In this paper, we will present...
Since the beginning of development Gran Telescopio Canarias (GTC), an Adaptive Optics (AO) system was considered necessary to exploit full diffraction-limited potential telescope. The GTC AO designed during last years is based on a single deformable mirror conjugated telescope pupil, and Shack-Hartmann wavefront sensor with 20 x subapertures, using OCAM2 camera. GTCAO will provide corrected beam Strehl Ratio (SR) 0.65 in K-band bright natural guide stars. Most subsystems have been...
The CAFADIS camera project has consisted in building a to measure wave-front phases and distances under different scenarios (from microns kilometres), using highly specialised electronic technology, namely Graphics Processing Units (GPUs) Field Programmable Gate Arrays (FPGAs). It is passive method of depth extraction, it uses incoherent light (natural light). In this paper we will present our new developments.
The plenoptic camera was originally created to allow the capture of light field, a four-variable volume representation all rays and their directions, which allows creation by synthesis an image observed object. This method has several advantages with regard 3D systems based on stereo cameras since it does not need frame synchronization or geometric color calibration. It also many applications, from 3DTV medical imaging. A uses microlens array measure radiance direction in scene. is placed at...
This paper revisits the problem of optimal (minimum variance) control for adaptive optics (AO) systems when measurement and command applications are asynchronous, resulting in a non-integer servo loop delay. When not properly accounted for, such fractional delays may severely degrade AO performance, especially presence high-frequency vibrations. We present evidence this performance degradation thanks to in-lab experimental measurements on Gran Telescopio Canarias Adaptive Optics (GTCAO)...
A new interferometric technique for Michelson wide-field interferometry is presented that consists of a pupil-plane combination scheme in which wide field view can be achieved one shot. This uses stair-shaped mirror the intermediate image plane each telescope array, allowing simultaneous correction differential delay on-axis and off-axis positions. Experimental results laboratory setup show it possible to recover fringes stars with an angular separation 1 arc min simultaneously similar...
Plenoptic imaging systems are becoming more common since they provide capabilities unattainable in conventional systems, but one of their main limitations is the poor bidimensional resolution. Combining wavefront phase measurement and plenoptic image deconvolution, we propose a system capable improving resolution when aberration present blurred. In this work, simulated using Fourier optics, results show that an improved achieved, even presence strong aberrations.