A5071332751- Advanced optical system design
- Optical Coatings and Gratings
- Orbital Angular Momentum in Optics
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Optics and Image Analysis
- Advanced Measurement and Metrology Techniques
- Nonlinear Photonic Systems
- Astronomical Observations and Instrumentation
- Vietnamese History and Culture Studies
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Plasmonic and Surface Plasmon Research
- Optical measurement and interference techniques
- Stellar, planetary, and galactic studies
- Quantum optics and atomic interactions
- Adaptive optics and wavefront sensing
- Liquid Crystal Research Advancements
- Ophthalmology and Visual Impairment Studies
- Optical Polarization and Ellipsometry
- Advanced Optical Imaging Technologies
- Fern and Epiphyte Biology
- Advanced Fiber Optic Sensors
Universidade de Santiago de Compostela
1988-2010
Goddard Space Flight Center
2004
Universidad de las Américas
1995
The Infrared Array Camera (IRAC) is one of three focal plane instruments in the Spitzer Space Telescope. IRAC a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 microns. Two nearly adjacent 5.2x5.2 arcmin fields view are viewed by four channels pairs (3.6 5.8 microns; 4.5 8 microns). All detector arrays 256x256 pixels size, with two shorter wavelength using InSb longer Si:As IBC detectors. powerful survey instrument because its high sensitivity, large...
To obtain analytical formulas for calculating the ocular rotation and prismatic effect with a general lens, centered or decentered, particular reference to thick spherotoric spectacle lenses.Linear theory is used, using symplectic properties of optical matrices, derive desired formulas.By applying cases, corresponding are obtained, sometimes recovering already known. Two examples serve illustrate use obtained compare results they provide ones by exact ray tracing.The linear derived allow...
The general solution presented here yields smooth, continuous, and monotonic refractive-index profiles for Luneburg-Morgan lenses with a boundary index of N > 1. new formula incorporates an original apparent-immersing method as well the continuous-deflection-function concept recently developed by one authors description waveguide lenses.
New cities, often designed as development strategies, cause dispossession, displacement, and disruption of everyday lives local communities. To further explore the effects new cities urban in Global South, this study explores realities farmers whose homes livelihoods are affected by construction Clark City Philippines. Employing concept right to city Henri Lefebvre, delves into farmers' agency reclaiming space being built on their rice fields. Through qualitative research methods, including...
The refractive-index profiles of planar matrix microlenses that result from the Luneburg lens theory turn out to yield considerable aberrations. presented modification design process enables satisfactory suppression focusing errors.
The generalized Luneburg lens problem has been reexamined with the aim of optimizing methods for computing integral, which determines refractive-index distribution spherically symmetric inhomogeneous lenses. As a result, substantial modifications have introduced into already known series representation this and novel solution derived that is rapidly converging short focal distances. Both representations are provided simple formulas quick estimation truncation error. Additionally, two...
Abstract Focal shift in lenslike systems having loss or gain is evaluated. The results obtained show a the geometrical focus with respect to lossless case. best determined for uniform plane and Gaussian illumination.
The ray matrix method (ABCD law) is used to determine the cardinal points of a gradient index lens. An analogy conventional simple optical system also established for which Gaussian and Newtonian formulas are applicable.
The gradient index (GRIN) lens law for Gaussian beams is derived by matrix formalism. By use of this law, image and focal shifts are evaluated. results applied to Selfoc lenses calculate positioning errors when GRIN connectors inserted into optical communication systems.
The purpose of this article is to compare different approximate formulas compute the prismatic effect in axially symmetric spectacle lenses.Gaussian calculate are derived, for thick and thin lenses, near far vision. results from these formulas, as well other taken literature, compared with exact results.None studied approximations provides most accurate all circumstances. Gaussian formula lenses could be considered globally accurate, both vision However, it notably more difficult use than...
Abstract The propagation of Gaussian beams through lenslike media with gain or loss is analysed in order to discuss the transformation these into uniform beams. results obtained are applied a medium increasing along radial direction.
Abstract This paper presents the spherically symmetric gradient-index axicon, a new kind of axicon that can be designed, using geometrical optics and conservation energy in geometric limit, to produce variety different intensity patterns along axis. The performance one particular design is analysed scalar wave model.
Abstract A general method is presented for designing spherically symmetric gradient-index axicons, which produce a variety of different intensity patterns along the axis, and with boundary index larger than or equal to surrounding medium. As design based on geometrical optics, tools analyse axicon using wave optics are given.
A new method of ray tracing through an inhomogeneous lens with radial symmetry the refractive-index distribution is proposed that consists a parametric determination polar coordinates current position.
Abstract A new type of spherically symmetric gradient index element is presented. These elements are able to transform an optical field from a point source with predetermined radiation pattern into arbitrary amplitude distribution in the target plane. The design method illustrated four examples formers that produce irradiance distributions constant, Gaussian, triangular and ring-shaped.
Expressions for the effective radius, angular aperture, numerical aperture and f-number are determined a general GRIN lens with axial radial variation of index profile. Obtained results applied to particular case Selfoc positive negative conical
Abstract A general method is presented for designing spherically symmetric gradient-index axicons, which produce a variety of different intensity patterns along the axis, and with boundary index larger than or equal to surrounding medium. As design based on geometrical optics, tools analyse axicon using wave optics are given.
We present a circular grating that encodes phase variations in the form of daisy flower, or pie, with several slices, petals, equal central angle and every other slice having delay (lambda) /2. suggest use this type for optical alignment.
We analyze the exact Fresnel diffraction in a GRIN Fiber Lens (GFL) due to its finite extent when it is illuminated by modal gaussian illumination. Its influence Single Mode Fibers (SMF) interconnections shown.
Focal Shift and Relative in a GRIN lens are evaluated when it is illuminated by Gaussian beam. An equivalent Fresnel Number stablished. The influence interconnections studied gaussian sources ultrashort focals considered. obtained results applied to Selfoc lenses.
When a GRIN lens is illuminated with point source, losses are caused when the emitted light restricted by effective radius (or equivalently, numerical aperture) of lens. Our purpose to find general expression for lenses revolution symmetry.
GRIN lens law for gaussian beams is derived by matrix formalism. Using this law, image and focal shifts are evaluated. The results applied to the Selfoc lenses in order evaluate positioning errors when connectors inserted into optical communication systems.