Author: Shyam Mandre Publisher: ISBN: 9783832512934 Category : Languages : en Pages : 0
Book Description
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.
Author: Cunzhu Tong Publisher: Elsevier ISBN: 0128141638 Category : Science Languages : en Pages : 208
Book Description
Nanoscale Semiconductor Lasers focuses on specific issues relating to laser nanomaterials and their use in laser technology. The book presents both fundamental theory and a thorough overview of the diverse range of applications that have been developed using laser technology based on novel nanostructures and nanomaterials. Technologies covered include nanocavity lasers, carbon dot lasers, 2D material lasers, plasmonic lasers, spasers, quantum dot lasers, quantum dash and nanowire lasers. Each chapter outlines the fundamentals of the topic and examines material and optical properties set alongside device properties, challenges, issues and trends. Dealing with a scope of materials from organic to carbon nanostructures and nanowires to semiconductor quantum dots, this book will be of interest to graduate students, researchers and scientific professionals in a wide range of fields relating to laser development and semiconductor technologies. - Provides an overview of the active field of nanostructured lasers, illustrating the latest topics and applications - Demonstrates how to connect different classes of material to specific applications - Gives an overview of several approaches to confine and control light emission and amplification using nanostructured materials and nano-scale cavities
Author: Edeltraud Gehrig Publisher: Springer Science & Business Media ISBN: 9783540007418 Category : Technology & Engineering Languages : en Pages : 252
Book Description
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.
Author: Junji Ohtsubo Publisher: Springer ISBN: 3319561383 Category : Science Languages : en Pages : 679
Book Description
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.
Author: Roland Diehl Publisher: Springer Science & Business Media ISBN: 3540478523 Category : Science Languages : en Pages : 420
Book Description
Starting from the basics of semiconductor lasers with emphasis on the generation of high optical output power the reader is introduced in a tutorial way to all key technologies required to fabricate high-power diode-laser sources. Various applications are exemplified.
Author: Peter W. Epperlein Publisher: John Wiley & Sons ISBN: 1118481860 Category : Technology & Engineering Languages : en Pages : 522
Book Description
This reference book provides a fully integrated novel approach to the development of high-power, single-transverse mode, edge-emitting diode lasers by addressing the complementary topics of device engineering, reliability engineering and device diagnostics in the same book, and thus closes the gap in the current book literature. Diode laser fundamentals are discussed, followed by an elaborate discussion of problem-oriented design guidelines and techniques, and by a systematic treatment of the origins of laser degradation and a thorough exploration of the engineering means to enhance the optical strength of the laser. Stability criteria of critical laser characteristics and key laser robustness factors are discussed along with clear design considerations in the context of reliability engineering approaches and models, and typical programs for reliability tests and laser product qualifications. Novel, advanced diagnostic methods are reviewed to discuss, for the first time in detail in book literature, performance- and reliability-impacting factors such as temperature, stress and material instabilities. Further key features include: practical design guidelines that consider also reliability related effects, key laser robustness factors, basic laser fabrication and packaging issues; detailed discussion of diagnostic investigations of diode lasers, the fundamentals of the applied approaches and techniques, many of them pioneered by the author to be fit-for-purpose and novel in the application; systematic insight into laser degradation modes such as catastrophic optical damage, and a wide range of technologies to increase the optical strength of diode lasers; coverage of basic concepts and techniques of laser reliability engineering with details on a standard commercial high power laser reliability test program. Semiconductor Laser Engineering, Reliability and Diagnostics reflects the extensive expertise of the author in the diode laser field both as a top scientific researcher as well as a key developer of high-power highly reliable devices. With invaluable practical advice, this new reference book is suited to practising researchers in diode laser technologies, and to postgraduate engineering students.
Author: Simon Rauch Publisher: Cuvillier Verlag ISBN: 3736961588 Category : Science Languages : en Pages : 112
Book Description
The beam quality and lifetime of gain-guided broad-area laser diodes degrades with increasing optical output power: The near field is progressively narrowed by thermo-optic effects, leading to an enhanced optical facet load and an over-proportionate far-field blooming. Common single-side emitting broad-area lasers are extremely asymmetric devices with respect to the longitudinal direction. The high semiconductor gain along with a high single-side output coupling leads to a strong asymmetry of the electric fields. Hence the internal optical power and thus the thermal load are highest in the vicinity of the out-coupling facet. Moreover, external optical feedback intensifies the optical and thermal load at the emission facet of the diode laser. In this thesis, the impact of the longitudinal distribution of internal intensity, temperature and gain on the lateral beam parameters is revealed. Numerical simulations demonstrate that homogenizing the longitudinal device temperature prevents near-field narrowing and accompanying far-field blooming, which is experimentally verified by symmetrizing the facet reflectivities. The second part of this work deals with the impact of spatially mismatched optical feedback on beam quality and lifetime. It is found that irradiance of solder and p-side metalization as well as the adjacent highly p-doped layers causes localized heating around the front facet, which strongly reduces the threshold for catastrophic optical damage. It was also found that lateral displacement of the feedback spot can lead to severe beam quality degradation for single-side emitting devices. This effect could be reduced by symmetrically out-coupling external-cavity configurations.
Author: B. Mroziewicz Publisher: Elsevier ISBN: 1483291650 Category : Science Languages : en Pages : 474
Book Description
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.
Author: Shyam Mandre
Author: Cunzhu Tong
Author: Edeltraud Gehrig
Author: Junji Ohtsubo
Author: Roland Diehl
Author: Peter W. Epperlein
Author: 
Author: Carlo Holly
Author: Simon Rauch
Author: B. Mroziewicz