Instabilités et chaos dans un laser à fibre dopée Nd3 PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Instabilités et chaos dans un laser à fibre dopée Nd3 PDF full book. Access full book title Instabilités et chaos dans un laser à fibre dopée Nd3 by Serge Bielawski. Download full books in PDF and EPUB format.
Author: Serge Bielawski
Publisher:
ISBN:
Category :
Languages : fr
Pages : 254
Get Book Here
Book Description
Le travail presente dans cette these concerne l'analyse de la dynamique d'un laser a fibre dopee au neodyme, emettant un rayonnement fortement multimode a 1080 nm. Les etudes experimentales ont montre que la dynamique du laser est dominee par des phenomenes de polarisation et nous ont conduits a elaborer un modele simple de laser a deux modes. Le bon accord entre les resultats numeriques et experimentaux nous amene a conclure que la dynamique du laser resulte d'un comportement collectif des nombreux modes oscillant selon chaque etat propre de polarisation. La seconde partie est consacree a l'elaboration d'outils permettant la stabilisation et la caracterisation d'etats instables du laser. Dans un premier temps, la stabilisation de l'etat stationnaire instable apparaissant en regime d'oscillations spontanees nous a permis d'obtenir des informations sur la position du point fixe et la dynamique dans son voisinage. En ce qui concerne les orbites periodiques instables, la methode mise au point a permis de stabiliser, mais egalement de suivre des orbites periodiques lorsqu'un parametre de controle varie. Experimentalement, la methode utilisee s'avere egalement efficace pour l'etude de la dynamique locale dans le voisinage des orbites instables et pour la localisation des bifurcations d'ou elles proviennent
Author: Serge Bielawski
Publisher:
ISBN:
Category :
Languages : fr
Pages : 254
Get Book Here
Book Description
Le travail presente dans cette these concerne l'analyse de la dynamique d'un laser a fibre dopee au neodyme, emettant un rayonnement fortement multimode a 1080 nm. Les etudes experimentales ont montre que la dynamique du laser est dominee par des phenomenes de polarisation et nous ont conduits a elaborer un modele simple de laser a deux modes. Le bon accord entre les resultats numeriques et experimentaux nous amene a conclure que la dynamique du laser resulte d'un comportement collectif des nombreux modes oscillant selon chaque etat propre de polarisation. La seconde partie est consacree a l'elaboration d'outils permettant la stabilisation et la caracterisation d'etats instables du laser. Dans un premier temps, la stabilisation de l'etat stationnaire instable apparaissant en regime d'oscillations spontanees nous a permis d'obtenir des informations sur la position du point fixe et la dynamique dans son voisinage. En ce qui concerne les orbites periodiques instables, la methode mise au point a permis de stabiliser, mais egalement de suivre des orbites periodiques lorsqu'un parametre de controle varie. Experimentalement, la methode utilisee s'avere egalement efficace pour l'etude de la dynamique locale dans le voisinage des orbites instables et pour la localisation des bifurcations d'ou elles proviennent
Author: Larry Schweikart
Publisher: Penguin
ISBN: 1101217782
Category : History
Languages : en
Pages : 1350
Get Book Here
Book Description
For the past three decades, many history professors have allowed their biases to distort the way America’s past is taught. These intellectuals have searched for instances of racism, sexism, and bigotry in our history while downplaying the greatness of America’s patriots and the achievements of “dead white men.” As a result, more emphasis is placed on Harriet Tubman than on George Washington; more about the internment of Japanese Americans during World War II than about D-Day or Iwo Jima; more on the dangers we faced from Joseph McCarthy than those we faced from Josef Stalin. A Patriot’s History of the United States corrects those doctrinaire biases. In this groundbreaking book, America’s discovery, founding, and development are reexamined with an appreciation for the elements of public virtue, personal liberty, and private property that make this nation uniquely successful. This book offers a long-overdue acknowledgment of America’s true and proud history.
Author: National Research Council
Publisher: National Academies Press
ISBN: 030903793X
Category : Science
Languages : en
Pages : 236
Get Book Here
Book Description
In the next 10 to 15 years, chemical engineers have the potential to affect every aspect of American life and promote the scientific and industrial leadership of the United States. Frontiers in Chemical Engineering explores the opportunities available and gives a blueprint for turning a multitude of promising visions into realities. It also examines the likely changes in how chemical engineers will be educated and take their place in the profession, and presents new research opportunities.
Author: Reina Gossett
Publisher: MIT Press
ISBN: 0262036606
Category : Social Science
Languages : en
Pages : 0
Get Book Here
Book Description
Essays, conversations, and archival investigations explore the paradoxes, limitations, and social ramifications of trans representation within contemporary culture. The increasing representation of trans identity throughout art and popular culture in recent years has been nothing if not paradoxical. Trans visibility is touted as a sign of a liberal society, but it has coincided with a political moment marked both by heightened violence against trans people (especially trans women of color) and by the suppression of trans rights under civil law. Trap Door grapples with these contradictions. The essays, conversations, and dossiers gathered here delve into themes as wide-ranging yet interconnected as beauty, performativity, activism, and police brutality. Collectively, they attest to how trans people are frequently offered “doors”—entrances to visibility and recognition—that are actually “traps,” accommodating trans bodies and communities only insofar as they cooperate with dominant norms. The volume speculates about a third term, perhaps uniquely suited for our time: the trapdoor, neither entrance nor exit, but a secret passageway leading elsewhere. Trap Door begins a conversation that extends through and beyond trans culture, showing how these issues have relevance for anyone invested in the ethics of visual culture. Contributors Lexi Adsit, Sara Ahmed, Nicole Archer, Kai Lumumba Barrow, Johanna Burton, micha cárdenas, Mel Y. Chen, Grace Dunham, Treva Ellison, Sydney Freeland, Che Gossett, Reina Gossett, Stamatina Gregory, Miss Major Griffin-Gracy, Robert Hamblin, Eva Hayward, Juliana Huxtable, Yve Laris Cohen, Abram J. Lewis, Heather Love, Park McArthur, CeCe McDonald, Toshio Meronek, Fred Moten, Tavia Nyong'o, Morgan M. Page, Roy Pérez, Dean Spade, Eric A. Stanley, Jeannine Tang, Wu Tsang, Jeanne Vaccaro, Chris E. Vargas, Geo Wyeth, Kalaniopua Young, Constantina Zavitsanos
Author: Merlin Sheldrake
Publisher: Random House
ISBN: 0525510338
Category : Science
Languages : en
Pages : 370
Get Book Here
Book Description
NEW YORK TIMES BESTSELLER • A “brilliant [and] entrancing” (The Guardian) journey into the hidden lives of fungi—the great connectors of the living world—and their astonishing and intimate roles in human life, with the power to heal our bodies, expand our minds, and help us address our most urgent environmental problems. “Grand and dizzying in how thoroughly it recalibrates our understanding of the natural world.”—Ed Yong, author of An Immense World ONE OF THE BEST BOOKS OF THE YEAR—Time, BBC Science Focus, The Daily Mail, Geographical, The Times, The Telegraph, New Statesman, London Evening Standard, Science Friday When we think of fungi, we likely think of mushrooms. But mushrooms are only fruiting bodies, analogous to apples on a tree. Most fungi live out of sight, yet make up a massively diverse kingdom of organisms that supports and sustains nearly all living systems. Fungi provide a key to understanding the planet on which we live, and the ways we think, feel, and behave. In the first edition of this mind-bending book, Sheldrake introduced us to this mysterious but massively diverse kingdom of life. This exquisitely designed volume, abridged from the original, features more than one hundred full-color images that bring the spectacular variety, strangeness, and beauty of fungi to life as never before. Fungi throw our concepts of individuality and even intelligence into question. They are metabolic masters, earth makers, and key players in most of life’s processes. They can change our minds, heal our bodies, and even help us remediate environmental disaster. By examining fungi on their own terms, Sheldrake reveals how these extraordinary organisms—and our relationships with them—are changing our understanding of how life works. Winner of the Wainwright Prize, the Royal Society Science Book Prize, and the Guild of Food Writers Award • Shortlisted for the British Book Award • Longlisted for the Rathbones Folio Prize
Author: Brent Fisse
Publisher: State University of New York Press
ISBN: 1438402929
Category : Social Science
Languages : en
Pages : 408
Get Book Here
Book Description
Uncertainty surrounds the use of publicity as a means of controlling corporate crime. On the one hand, some agree with Justice Brandeis's dictum that light is "the best of disinfectants...the most efficient policeman." On the other hand, many believe that corporations' internal affairs are effectively shrouded with a thick fog that prevents the light of public scrutiny from reaching them. The Impact of Publicity on Corporate Offenders is the first study to go beyond the rhetoric, through an examination of corporate experience. Fisse and Braithwaite have carried out a qualitative inquiry concerning 17 large corporations involved in publicity crises. Based mainly on interviews, the inquiry includes company employees and former employees, union officials, officers of government regulatory agencies, competitors, independent accountants, government prosecutors, public interest activists, judicial officers, stockbrokers, and other experts.
Author: Erik Brattberg
Publisher:
ISBN: 9780990772019
Category : Political Science
Languages : en
Pages : 0
Get Book Here
Book Description
The Center for Transatlantic Relations and the Swedish Institute of International Affairs have brought together strategists and experienced practitioners from many different countries to explore how long-term global trends may impact the future of critical global flows-in areas such as energy, resources, IT and communications, trade, ideas, technology, finance, and illicit flows. Policy recommendations focus on how the European Union and the United States can work together to help ensure the continuity and maintenance of these critical global flows as we look towards 2030.
Author: Elias Burstein
Publisher: Springer Science & Business Media
ISBN: 1461519632
Category : Science
Languages : en
Pages : 900
Get Book Here
Book Description
The optical properties of semiconductors have played an important role since the identification of semiconductors as "small" bandgap materials in the thinies, due both to their fundamental interest as a class of solids baving specific optical propenies and to their many important applications. On the former aspect we can cite the fundamental edge absorption and its assignment to direct or indirect transitions, many-body effects as revealed by exciton formation and photoconductivity. On the latter aspect, large-scale applications sucb as LEDs and lasers, photovoltaic converters, photodetectors, electro-optics and non-linear optic devices, come to mind. The eighties saw a revitalization of the whole field due to the advent of heterostructures of lower-dimensionality, mainly two-dimensional quantum wells, which through their enhanced photon-matter interaction yielded new devices with unsurpassed performance. Although many of the basic phenomena were evidenced through the seventies, it was this impact on applications which in turn led to such a massive investment in fabrication tools, thanks to which many new structures and materials were studied, yielding funher advances in fundamental physics.
Author: Jakob Vlietstra
Publisher: Springer Science & Business Media
ISBN: 1447102630
Category : Computers
Languages : en
Pages : 703
Get Book Here
Book Description
This Dictionary covers information and communication technology (ICT), including hardware and software; information networks, including the Internet and the World Wide Web; automatic control; and ICT-related computer-aided fields. The Dictionary also lists abbreviated names of relevant organizations, conferences, symposia and workshops. This reference is important for all practitioners and users in the areas mentioned above, and those who consult or write technical material. This Second Edition contains 10,000 new entries, for a total of 33,000.
Author: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
Get Book Here
Book Description
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
