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Tesis sobre el tema "Laser beam steering"

Autor: Grafiati
Publicado: 14 de marzo de 2023

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1

Bas, Derek. "Laser Beam Steering with Thin Film GaAs on Plastic." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277119321.

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2

Hällstig, Emil. "Nematic Liquid Crystal Spatial Light Modulators for Laser Beam Steering." Doctoral thesis, Uppsala University, Quantum Chemistry, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4693.

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<p>Laser beam control is important in many applications. Phase modulating spatial light modulators (SLMs) can be used to electronically alter the phase distribution of an optical wave-front and thus change the direction and shape of a laser beam. Physical constraints set limitations to the SLM and an ideal phase distribution can usually not be realised. In order to understand how such components can be used for non-mechanical beam control three nematic liquid crystal (NLC) SLMs have been thoroughly characterised and modelled.</p><p>The pixel structure and phase quantisation give a discrepancy
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3

Hällstig, Emil. "Nematic liquid crystal spatial light modulators for laser beam steering /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4693.

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4

Liu, Yifan. "The True-Time-Delay (TTD) Laser Beam Steering System Design Based on Fourier Cell." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1237915468.

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5

SANTAGATA, ROSA. "Sub-nanometer length metrology for ultra-stable ring laser gyroscopes." Doctoral thesis, Rosa Santagata, 2015. http://hdl.handle.net/11365/1004514.

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Large-frame ring laser gyroscopes are extremely sensitive inertial detectors of rotational motion. When properly coupled to the ground, they provide precise measurements of the Earth rotation rate and give important informations to geodesy and geophysics. Recent advances in this technology led to consider the application of ring laser gyroscopes to fundamental physics. In this context is GINGER (Gyroscopes IN GEneral Relativity), a scientic proposal for testing General Relativity (local observation of the Lense-Thirring eect) with a ground-based array of ring laser gyroscopes. The experimental
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6

Evans, Jonathan W. "Beam Switching of an Nd:YAG Laser Using Domain Engineered Prisms in Magnesium Oxide Doped Congruent Lithium Niobate." University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1281366442.

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7

Bugoffa, Salaheddeen G. "Acousto-Optic Scanning and Reflection Sensing for Large Area Object Search and Recovery." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1470257122.

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8

Shi, Lei. "Tunable liquid crystal polarization gratings." [Kent, Ohio] : Kent State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1258988951.

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Thesis (Ph.D.)--Kent State University, 2009.<br>Title from PDF t.p. (viewed Apr. 22, 2010). Advisor: Philip Bos. Keywords: Liquid crystal; beam steering; polarization gratings; diffraction efficiency; decentered microlens array. Includes bibliographical references (p. 216-219).
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9

Tran, Tuan-Anh. "Multiple-input multiple-output optical wireless communications." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:094fbe23-88c3-49c4-b64b-a1de40674123.

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Visible-light optical wireless communications (OWC) is a potential technology that can help resolve the crowdedness of the radio-frequency bands, whilst conveniently exploiting energy-saving light-emitting diodes (LEDs) as transmitters for both illumination and communications. Since there usually are many LEDs in a lighting unit, OWC has a multi- input multi-output (MIMO) geometry which, thanks to its channel diversity, can offer wireless local networks at data-rates many times higher than possible with single-channel systems. In such systems, MIMO-detection methods to separate the different o
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10

Khan, Sajjad. "Liquid Crystal Optics for Communications, Signal Processing and 3-D Microscopic Imaging." Doctoral diss., University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3389.

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This dissertation proposes, studies and experimentally demonstrates novel liquid crystal (LC) optics to solve challenging problems in RF and photonic signal processing, freespace and fiber optic communications and microscopic imaging. These include free-space optical scanners for military and optical wireless applications, variable fiber-optic attenuators for optical communications, photonic control techniques for phased array antennas and radar, and 3-D microscopic imaging. At the heart of the applications demonstrated in this thesis are LC devices that are non-pixelated and can be controlled
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11

Reardon, Christopher P. "Free space optical interconnects for speckled computing." Thesis, St Andrews, 2009. http://hdl.handle.net/10023/698.

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12

Sun, Fei. "Thermally induced beam steering in high power diode-pumped planar waveguide lasers." Thesis, Heriot-Watt University, 2007. http://hdl.handle.net/10399/94.

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13

Penner, Robert Scott. "Focusing, wavelength tuning, beam steering and beam shaping of circular grating surface emitting distributed Bragg reflector lasers." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284042.

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Over the past decade, circular grating surface emitting DBR lasers (CGSELs) have progressed from theory to reality. These devices possess several properties that make them attractive options for such applications as optical interconnects and laser arrays. These advantages include low divergence angles, circular beam profiles, and high power output. In this dissertation, the addition of new functionality to these lasers including wavelength tunability, focusing, beam steering and beam shaping is investigated. The theory governing device operation is presented. Pertinent discussions include the
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14

French, Kyle J. "Growth of Optical Quality Lead Magnesium Niobate-Lead Titanate Thick Films." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1575993750125728.

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15

Tanagardi, Mehmet. "Radiation Pattern Reconfigurable Horn Antenna Based on Parasitic Layer Concept." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7623.

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In recent years, multi-functional reconfigurable antennas (MRA) has attracted much attention in wireless communication. The reconfigurable antenna can adapt itself with changing system conditions, and it can provide different multi-functionalities which can give better system performances. Instead of using multiple antennas, a single reconfigurable antenna can provide the same performance and occupy less space. By using the parasitic layer technique, an antenna can be turned into a reconfigurable antenna. The main objective of this thesis is to study radiation pattern reconfiguration of the ho
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16

Ali, Mohamed Ali Sayed Ahmed Ahmed. "Développement de nouveaux composants passifs multicouches et l'implémentation d'une matrice de Butler large-bande et compacte en technologie GIS." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0027/document.

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Les systèmes de communications sans fils actuels imposent des contraintes très sévères en termes de la capacité du canal, la qualité de transmission tout en gardant les niveaux d'interférences et multi-trajets assez faibles. De telles contraintes ont rendu les antennes multifaisceaux un élément essentiel dans ces systèmes. Parmi les techniques permettant de réaliser une antenne multifaisceaux (sans avoir recours aux systèmes à balayages électroniques), un réseau d'antennes élémentaires est associé à un réseau d'alimentation (une matrice) à formation de faisceau (Beam Forming Network-BFN). Parm
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17

Samantaray, Swastik. "Robust Adaptive Control of a Laser Beam System for Static and Moving Targets." Thesis, 2016. http://hdl.handle.net/2005/3204.

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The motivation of this thesis is to propose a robust control technique for a laser beam system with target estimation. The laser beam is meant to track and fall on a particular portion of the target until the operation is accomplished. There are many applications of such a system. For example, laser range finder uses laser beam to determine the distance of the target from the source. Recently, unmanned aerial drones have been developed that run on laser power. Drone batteries can be recharged with power sup-ply from laser source on the ground. Laser is also used in high energy laser weapon for
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18

Cox, Wesley. "Magnetic steering of the ion beam in the Helicon Double Layer Thruster." Phd thesis, 2010. http://hdl.handle.net/1885/150366.

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Experiments are performed in the CHI KUNG plasma reactor to study the effect of introducing transverse components (aligned along the x-axis) to the cylindrically symmetric magnetic field (aligned along the z-axis) to produce magnetic steering of the ion beam in the Helicon Double Layer Thruster (HDLT). CHI KUNG is a cylindrical helicon plasma reactor, on which the first HDLT prototype is based, consisting of a 15 cm diameter, 31 cm long Pyrex source tube attached contiguously to a 32 cm diameter, 30 cm long aluminium diffusion chamber. Coaxially surrounding the source tube is an 18 cm long dou
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19

Zakariya, Abdullah. "Monolithically Integrated Broadly Tunable Light Emitters based on Selectively Intermixed Quantum Wells." Doctoral diss., 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6210.

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A monolithically integrated broadly tunable MQW laser that utilizes a combined impurity-free vacancy disordering (IFVD) of quantum wells and optical beam steering techniques is proposed and investigated experimentally. The device consists of a beam-steering section and an optical amplifier section fabricated on a GaAs/AlGaAs quantum well (QW) p-i-n heterostructure. The beam steering section forms a reconfigurable optical waveguide that can be moved laterally by applying separately controlled electrical currents to two parallel contact stripes. The active core of the gain section is divided in
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