Polarization spatial dynamics in a transverse multimode CO2 laser with optical feedback

2012 ◽  
Author(s):  
R. Meucci ◽  
S. De Nicola ◽  
K. Al Naimee ◽  
S. F. Abdalah ◽  
F. T. Arecchi
Keyword(s):  
Optical Feedback ◽  
Spatial Dynamics

scholarly journals Моделирование пространственной динамики включения лазера-тиристора (λ=905 нм) на основе многопереходной гетероструктуры AlGaAs/InGaAs/GaAs

2020 ◽  
Vol 54 (5) ◽  
pp. 478
Author(s):  
О.С. Соболева ◽  
В.С. Головин ◽  
В.С. Юферев ◽  
П.С. Гаврина ◽  
Н.А. Пихтин ◽  
...  
Keyword(s):  
Electric Fields ◽  
Carrier Transport ◽  
Impact Ionization ◽  
Transport Model ◽  
Optical Feedback ◽  
Spatial Dynamics ◽  
Velocity Saturation ◽  
Current Localization ◽  
Thyristor Switch ◽  
Spatial Current

Abstract A 2D carrier transport model to be used in studying the spatial current dynamics in laser thyristors is presented. The model takes into account such features as optical feedback, impact ionization, and drift velocity saturation in strong electric fields. It is shown that there is current localization during laser-thyristor switch-on. A relationship is demonstrated between the distribution nonuniformity of the control current and its amplitude and position of the initial switch-on region. The time of laser-thyristor switch-on is 13 ns at a feed voltage of 26V, with a time of switch-on spreading over the entire 200-μm stripe width of ~65 ns. These parameters remain invariable irrespective of the switch-on spatial dynamics.

Sozial-räumliche Dynamiken der Agrartreibstoffe.

2016 ◽  
Vol 46 (184) ◽  
pp. 423-440 ◽  
Author(s):  
Kristina Dietz ◽  
Bettina Engels ◽  
Oliver Pye
Keyword(s):  
Political Economy ◽  
Capital Flows ◽  
Spatial Dynamics ◽  
Financial Sector ◽  
Comprehensive Analysis ◽  
Spatial Theory ◽  
Global Political Economy

This article explores the spatial dynamics of agrofuels. Building on categories from the field of critical spatial theory, it shows how these categories enable a comprehensive analysis of the spatial dynamics of agrofuels that links the macro-structures of the global political economy to concrete, place-based struggles. Four core socio-spatial dynamics of agrofuel politics are highlighted and applied to empirical findings: territorialization, the financial sector as a new scale of regulation, place-based struggles and transnational spaces of resources and capital flows.

Synchronization of Chaotic Quantum Dot Light Emitting Diodes under Optical Feedback Effect

2020 ◽  
pp. 144-148
Keyword(s):  
Quantum Dot ◽  
Delay Time ◽  
Chaos Synchronization ◽  
Optical Feedback ◽  
Light Emitting Diode ◽  
Feedback Effect ◽  
Complete Synchronization ◽  
Light Emitting ◽  
Coupling Methods ◽  
Coupling Parameters

Chaos synchronization of delayed quantum dot light emitting diode has been studied theortetically which are coupled via the unidirectional and bidirectional. at synchronization of chaotic, The dynamics is identical with delayed optical feedback for those coupling methods. Depending on the coupling parameters and delay time the system exhibits complete synchronization, . Under proper conditions, the receiver quantum dot light emitting diode can be satisfactorily synchronized with the transmitter quantum dot light emitting diode due to the optical feedback effect.

Temporal and spatial dynamics of pulse production in India

2017 ◽  
Author(s):  
International Food Policy Research Institute (IFPRI)
Keyword(s):  
Spatial Dynamics ◽  
Temporal And Spatial ◽  
Pulse Production

REPRESENTAÇÃO MULTIESCALAR DO AMBIENTE GEOMORFOLÓGICO DA PRAIA DAS FONTES – CEARÁ

2019 ◽  
Vol 21 (2) ◽  
pp. 1217-1233
Author(s):  
Filipe Maciel De Moura ◽  
Antônio Rodrigues Ximenes Neto ◽  
Adryane Gorayeb ◽  
Davis Pereira De Paula ◽  
Fábio Perdigão Vasconcelos
Keyword(s):  
Coastal Plain ◽  
Environmental Conditions ◽  
Spatial Dynamics ◽  
Point Of View ◽  
Coastal Geomorphology ◽  
Multi Scale ◽  
Morphological System

A planície costeira brasileira, em especial a do Nordeste do Brasil, apresenta um sistema morfológico que sofre diversas pressões do ponto de vista do uso e ocupação dos seus espaços. Logo, o entendimento da dinâmica natural e espacial desse ambiente requer a adoção de metodologias que contemplem uma abordagem em múltiplas escalas. Neste sentido, este trabalho tem o intuito de analisar as múltiplas morfologias associadas a praia das Fontes, em Beberibe-CE, em diferentes escalas taxonômicas. Esta análise auxiliou na realização de um prognostico das condições ambientais e de sua capacidade de suporte. Metodologicamente aplicou-se a proposta de Bertrand (1971), adotando-se apenas as unidades inferiores que inclui os níveis taxonômicos regionais e/ou locais, compreendendo os geossistemas, geofáciese os geótopos. Os resultados alcançados foram satisfatórios, uma vez que as unidades mapeadas foram validadas em atividades de campo para reconhecimento do produto cartográfico.Palavras-chave: Análise Multiescalar. Geomorfologia Costeira. Formação Barreiras. ABSTRACTThe Brazilian coastal plain, especially in the Northeast of Brazil, presents a morphological system that undergoes several pressures from the point of view of the use and occupation of its spaces. Therefore, the understanding of the natural and spatial dynamics of this environment requires the adoption of methodologies that contemplate a multi-scale approach. In this sense, this work has the purpose of analyzing the multiple morphologies associated to Praia das Fontes, in Beberibe-CE, at different taxonomic scales. This analysis assisted in the accomplishment of a prognosis of the environmental conditions and their support capacity. Methodologically Bertrand's (1972) proposal was applied, adopting only the lower units that includes regional and / or local taxonomic levels, including geosystems, geophysics and geo-objects. The results were satisfactory, since the mapped units were validated in field activities to recognize the cartographic product.Keywords: Multiscalar Analysis. Coastal Geomorphology. Training Barriers. RESUMENLa llanura costera brasileña, especialmente en el noreste de Brasil, tiene un sistema morfológico que sufre varias presiones desde el punto de vista del uso y la ocupación de sus espacios. Por lo tanto, comprender la dinámica natural y espacial de este entorno requiere la adopción de metodologías que incluyan un enfoque de múltiples escalas. En este sentido, este trabajo tiene como objetivo analizar las múltiples morfologías asociadas a la playa de Fontes, en Beberibe-CE, en diferentes escalas taxonómicas. Este análisis ayudó a hacer una predicción de las condiciones ambientales y su capacidad de carga. Metodológicamente, se aplicó la propuesta de Bertrand (1971), adoptando solo las unidades inferiores, que incluyen niveles taxonómicos regionales y / o locales, incluidos los geosistemas, geofacies y geotopos. Los resultados obtenidos fueron satisfactorios, ya que las unidades mapeadas fueron validadas en actividades de campo para el reconocimiento de productos cartográficos.Palabras clave: Análisis multiescala. Geomorfología costera. Barreras de entrenamiento.

Tunable Photonic Microwave Oscillator Self-Locked by Polarization-Rotated Optical Feedback (Preprint)

2013 ◽  
Author(s):  
Nicholas G. Usechak ◽  
Vassilios Kovanis ◽  
T. B. Simpson ◽  
Jia-Ming Liu ◽  
Mohammad AlMulla
Keyword(s):  
Optical Feedback ◽  
Microwave Oscillator
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