Download or read book Spatial Dynamics of Semiconductor Lasers written by John A. Houlihan and published by . This book was released on 2002 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of semiconductor lasers over the past 40 years has been concerned with both their operating characteristics and their properties as a non-linear optical system. In particular, the transition from stable dynamical operation to a more complex dynamical state, when the number of degrees of freedom of the system is increased, is of great interest from technological as well as fundamental viewpoints. This thesis will examine two examples of this type of extension namely, the increase in the transverse size of the laser cavity and the effect of delayed external incoherent feedback, on the lasers dynamics. In the former case we will study a mechanism for the stabilization of the chaotic output of the laser and in the latter we will identify some instabilities and discuss their properties. Broad area lasers are ubiquitous in modern optical fiber networks, their main application being the pumping of erbium doped fiber amplifiers. They are characterized by their ease of fabrication and subsequent low cost. However, they display complex chaotic spatio-temporal dynamics at high output powers which leads to a loss in the spatial coherence of the laser beam. This loss in spatial coherence limits the applications of these devices and/or constrains the laser to operate at low output powers. We will analyse, both experimentally and theoretically, a simple technique which may be used to stabilize the output of these simple broad area lasers, namely transverse injection profiling. The mechanism for stabilization of these lasers is identified and an alternative implementation is discussed. In the remainder of the thesis, the effect of incoherent delayed feedback on a single transverse mode, multi-longitudinal mode semiconductor laser is experimentally analysed. This experiment is motivated by the large amount of theoretical and experimental work concerning both regular and phase conjugate optical feedback in semiconductor laser devices. In these situations, the dynamical evolution is determined by the coupling between the carriers, the optical intensity and the phase difference between the laser output and delayed field. In the incoherent case, the phase difference may be neglected. In particular, the effect of phase amplitude coupling, which plays a crucial role in the coherent and phase-conjugate feedback situations, may be neglected in the incoherent feedback case. This is because the external cavity system is no longer sensitive to small changes in the solitary laser frequency. However, the system still displays a number of intensity instabilities, similar to the coherent feedback case, whose nature will be discussed.
Download or read book Spatial and Polarization Dynamics of Semiconductor Lasers written by J. H. Eberly and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatio Temporal Dynamics and Quantum Fluctuations in Semiconductor Lasers written by Edeltraud Gehrig and published by Springer Science & Business Media. This book was released on 2003-09-22 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents fundamental theories and simulations of the spatio-temporal dynamics and quantum fluctuations in semiconductor lasers. The dynamic interplay of light and matter is theoretically described by taking into account microscopic carrier dynamics, spatially dependent light-field propagation and the influence of spontaneous emission and noise.
Download or read book Dynamics of Lasers written by C. O. Weiss and published by Wiley-VCH. This book was released on 1991 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monograph on laser dynamics, intended for those involved with laser optics, nonlinear dynamics, atomic physics, solid state physics molecular physics and spectroscopy. Subjects covered include the history of laser dynamics, theoretical models of nonlinear dynamics, and practical usage.
Download or read book Semiconductor Lasers written by Junji Ohtsubo and published by Springer. This book was released on 2017-05-03 with total page 679 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the fascinating recent advances made concerning the chaos, stability and instability of semiconductor lasers, and discusses their applications and future prospects in detail. It emphasizes the dynamics in semiconductor lasers by optical and electronic feedback, optical injection, and injection current modulation. Applications of semiconductor laser chaos, control and noise, and semiconductor lasers are also demonstrated. Semiconductor lasers with new structures, such as vertical-cavity surface-emitting lasers and broad-area semiconductor lasers, are intriguing and promising devices. Current topics include fast physical number generation using chaotic semiconductor lasers for secure communication, development of chaos, quantum-dot semiconductor lasers and quantum-cascade semiconductor lasers, and vertical-cavity surface-emitting lasers. This fourth edition has been significantly expanded to reflect the latest developments. The fundamental theory of laser chaos and the chaotic dynamics in semiconductor lasers are discussed, but also for example the method of self-mixing interferometry in quantum-cascade lasers, which is indispensable in practical applications. Further, this edition covers chaos synchronization between two lasers and the application to secure optical communications. Another new topic is the consistency and synchronization property of many coupled semiconductor lasers in connection with the analogy of the dynamics between synaptic neurons and chaotic semiconductor lasers, which are compatible nonlinear dynamic elements. In particular, zero-lag synchronization between distant neurons plays a crucial role for information processing in the brain. Lastly, the book presents an application of the consistency and synchronization property in chaotic semiconductor lasers, namely a type of neuro-inspired information processing referred to as reservoir computing.
Download or read book Spatial Mode Dynamics in Wide Aperture Semiconductor Lasers written by Jayanta Mukherjee and published by . This book was released on 2009 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scaling the brightness (spatial coherence) along with output power has been a long-standing problem for semiconductor lasers. The difficulty arises due to complex spatiotemporal modal filamentation associated with light-matter interaction in the non-linear semiconductor lasing medium. This work presents a detailed study of spatiotemporal dynamics in wide aperture semiconductor lasers with the motivation of the identifying factors limiting brightness scaling in the high power regime thereby finding routes to scale the brightness using the unique properties of quantum confined active regions. In this view an opto-electro-thermal model is developed within the Maxwell-Bloch formalism with the capability of describing, frequency, carrier and temperature dependent semiconductor gain and dispersion. The model captures the essential spatiotemporal dynamics in both the thermal and non-thermal regimes and for both homogenous and inhomogeneous broadening in the semiconductor lasing medium. First a steady-state electro-thermal model is developed to simulate the current and heat spreading in the device. Finite element technique (FEM) based simulations are compared with experimental temperature maps obtained from micro-thermographic analysis producing an excellent match resulting in the first concerted study of bulk thermal properties of broad area quantum dot lasers. The thermal model is then used in conjunction with the Maxwell-Bloch based opto-electro-thermal model to obtain pump-dependent modal intensity structure and spatial frequency spectral characteristics. Effect of both homogeneous and inhomogeneous gain broadening is analysed in both the thermal and non-thermal regimes. It is shown via linear stability analysis and high resolution FEM simulations that presence of inhomogeneous gain broadening leads to improved spatial coherence and suppressed filamentation in both thermal and non-thermal regimes. A novel technique based on decoupling of lateral travelling waves corresponding to higher order spatial modes via index-anti-guiding is also described leading to a complete suppression of filamentary modal behaviour. Preliminary experimental results are presented validating the theoretical prediction.
Download or read book Semiconductor Lasers and Laser Dynamics written by and published by . This book was released on 2004 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Distributed Feedback Lasers and Semiconductor Laser Arrays written by Yuan-Hwang Liao and published by . This book was released on 1997 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics of Semiconductor Lasers written by B. Mroziewicz and published by Elsevier. This book was released on 2017-01-31 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written for readers who have some background in solid state physics but do not necessarily possess any knowledge of semiconductor lasers, this book provides a comprehensive and concise account of fundamental semiconductor laser physics, technology and properties. The principles of operation of these lasers are therefore discussed in detail with the interrelations between their design and optical, electrical and thermal properties. The relative merits of a large number of laser structures and their parameters are described to acquaint the reader with the various aspects of the semiconductor lasers and the trends in their development.
Download or read book Principles of Laser Dynamics written by Y.I. Khanin and published by Newnes. This book was released on 2012-12-02 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph summarizes major achievements in laser dynamics over the past three decades. The book begins with two introductory Chapters. Chapter 1 offers general considerations on quantum oscillators, formulates the requirements for the laser key elements and shows how these requirements are met in different laser systems. The second Chapter proposes the mathematical models used in semiclassical laser theory, discusses the approximations and simplifications in particular cases, and specifies the range of applicability of these models. In Chapters 3-5 attention is given primarily to the steady states and their stability, the laser behavior in the instability domain, the characteristics of regular and chaotic pulsations and the nature of their mechanisms. Chapter 6 deals with the processes in a laser, accompanying the time variance of laser parameters. Considerable attention is given to a laser response to weak, low-frequency modulation of the parameters. The problems addressed therein are resonant modulation enhancement, transition to the nonlinear regime, chaotic response to periodic impact, spike-like generation due to variation of the cavity geometry and a laser rod temperature drift. Laser behavior is subject to qualitative changes if its optical elements exhibit nonlinear properties. The action of a saturable absorber, which leads to a loss of laser stability and provides passive Q-modulation, is investigated. To a much lesser degree the researchers' attention has been attracted by other nonlinear effects such as self-focusing, e.g., which may have a strong influence on laser dynamics. All of these issues are covered in Chapter 7. The book is intended for researchers, engineers, graduate and post-graduate students majoring in quantum electronics.
Download or read book Semiconductor Laser Physics written by Weng W. Chow and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor-Laser Physics discusses the underlying physics and operational principles of semiconductor lasers. The optical and electronic properties of the semiconductor medium are analyzed in detail, including quantum confinement and gain engineering effects. A semiclassical and a quantum version of the laser theory are presented, including an analysis of single- and multimode operation, instabilities, laser arrays, unstable resonators, and microcavity lasers.
Download or read book Semiconductor Laser Dynamics written by Daan Lenstra and published by . This book was released on 2020-09-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of 18 papers, two of which are reviews and seven are invited feature papers, that together form the Photonics Special Issue "Semiconductor Laser Dynamics: Fundamentals and Applications", published in 2020. This collection is edited by Daan Lenstra, an internationally recognized specialist in the field for 40 years.
Download or read book Spatio temporal Dynamics of Semiconductor Lasers written by Ortwin Hess and published by . This book was released on 1996 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatio temporal Dynamics of Semiconductor Lasers written by Ortwin Hess and published by . This book was released on 1993 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spatio-temporal dynamics of multi-stripe and broad-area semiconductor laser arrays are studied theoretically. A hierarchy of microscopic and phenomenological model equations, which describe the interaction between the optical field and the active semiconductor medium, are formulated.
Download or read book Influence of Nonlinear Optical Effects on the Spatial Dynamics of Intense Laser Beams written by Kevin Daniel Moll and published by . This book was released on 2003 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Dynamics of Picosecond CO Sub 2 Laser Pulses Produced by Optical Switching in Ge written by and published by . This book was released on 1991 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design, test and optimization of a picosecond CO2 pulse-forming system are presented. The system switches a semiconductor's optical characteristics at 10 [mu]m under the control of a synchronized 1.06-[mu]m Nd:YAG picosecond laser pulse. An energy-efficient version of such a system using collimated beams is described. A simple, semi-empirical approach is used to simulate the switching process, specifically including the spatial distributions of the laser energy and phase, which are relevant for experiments in laser-driven electron acceleration. 11 refs., 7 figs.
Download or read book Controlling the Emission Properties of High Power Semiconductor Lasers written by Shyam Mandre and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The output powers of semiconductor lasers (SLs) are significantly enhanced by increasing the emitting area of the devices. However, increasing the output power can lead to deteriorated static and dynamic emission properties of high power SLs. In this thesis, various controlschemes based on spatially and spectrally filtered optical feedback are presented which, both, improve the beam quality and stabilize the nonlinear spatiotemporal emission dynamics of broad-area SLs and of broad-area vertical-cavity surface-emitting lasers (BA-VCSEL). Next to the dynamic emission properties of high-power SLs, their spatial coherence properties can be manipulated, which is of particular interest for various applications. A drastic reduction of the spatial coherence is shown to result in fundamentally modified beam characteristics of a BA-VCSEL. Time-resolved measurements of the evolution of the emission are presented giving insight into the thermal mechanisms responsible for the loss of spatial coherence.
