Search Results for: quantum dot lasers

Blog
Blog

Dynamic Scenarios In Two State Quantum Dot Lasers

Dynamic Scenarios in Two State Quantum Dot Lasers PDF
Author: André Röhm
Publisher: Springer
ISBN: 3658094028
Size: 22.62 MB
Format: PDF
Category : Science
Languages : en
Pages : 102
View: 6573

Get Book

André Röhm investigates the dynamic properties of two-state lasing quantum dot lasers, with a focus on ground state quenching. With a novel semi-analytical approach, different quenching mechanisms are discussed in an unified framework and verified with numerical simulations. The known results and experimental findings are reproduced and parameter dependencies are systematically studied. Additionally, the turn-on dynamics and modulation response curves of two-state lasing devices are presented.

Quantum Dot Lasers

Quantum Dot Lasers PDF
Author: Victor Mikhailovich Ustinov
Publisher: Oxford University Press on Demand
ISBN: 9780198526797
Size: 13.48 MB
Format: PDF, ePub
Category : Science
Languages : en
Pages : 290
View: 4539

Get Book

A book devoted to the physics and technology of diode lasers based on self-organized quantum dots. It first addresses fundamentals of semiconductor quantum dot fabrication along with structural and electronic properties of quantum dots and secondly, use of self-organized quantum dots in laser structures, their properties and optimization.

Dynamics Of Quantum Dot Lasers

Dynamics of Quantum Dot Lasers PDF
Author: Christian Otto
Publisher: Springer Science & Business Media
ISBN: 3319037862
Size: 17.84 MB
Format: PDF
Category : Science
Languages : en
Pages : 290
View: 6058

Get Book

This thesis deals with the dynamics of state-of-the-art nanophotonic semiconductor structures, providing essential information on fundamental aspects of nonlinear dynamical systems on the one hand, and technological applications in modern telecommunication on the other. Three different complex laser structures are considered in detail: (i) a quantum-dot-based semiconductor laser under optical injection from a master laser, (ii) a quantum-dot laser with optical feedback from an external resonator, and (iii) a passively mode-locked quantum-well semiconductor laser with saturable absorber under optical feedback from an external resonator. Using a broad spectrum of methods, both numerical and analytical, this work achieves new fundamental insights into the interplay of microscopically based nonlinear laser dynamics and optical perturbations by delayed feedback and injection.

Quantum Dot Heterostructures

Quantum Dot Heterostructures PDF
Author: Dieter Bimberg
Publisher: John Wiley & Sons
ISBN: 9780471973881
Size: 49.68 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 338
View: 3524

Get Book

Quantum Dot Heterostructures Dieter Bimberg, Marius Grundmann and Nikolai N. Ledentsov Institute of Solid State Physics, Technische Universitï¿1⁄2t Berlin, Germany Quantum dots are nanometer-size semiconductor structures, and represent one of the most rapidly developing areas of current semiconductor research as increases in the speed and decreases in the size of semiconductor devices become more important. They present the utmost challenge to semiconductor technology, making possible fascinating novel devices. This important new reference book focuses on the key phenomena and principles. Chapter 1 provides a brief account of the history of quantum dots, whilst the second chapter surveys the various fabrication techniques used in the past two decades, and introduces the concept of self-organized growth. This topic is expanded in the following chapter, which presents a broad review of self-organization phenomena at surfaces of crystals. Experimental results on growth of quantum dot structures in many different systems and on their structural characterization are presented in Chapter 4. Basic properties of the dots relate to their geometric structure and chemical composition. Numerical modeling of the electronic and optical properties of real dots is presented in Chapter 5, together with general theoretical considerations on carrier capture, relaxation, recombination and properties of quantum dot lasers. Chapters 6 and 7 summarize experimental results on electronic, optical and electrical properties. The book concludes by disoussing highly topical results on quantum-dot-based photonic devices - mainly quantum dot lasers. Quantum Dot Heterostructures is written by some of the key researchers who have contributed significantly to the development of the field, and have pioneered both the theoretical understanding of quantum dot related phenomena and quantum dot lasers. It is of great interest to graduate and postgraduate students, and to researchers in semiconductor physics and technology and optoelectronics.

Quantum Dot Lasers

Quantum Dot Lasers PDF
Author:
Publisher:
ISBN:
Size: 34.75 MB
Format: PDF, Mobi
Category : Diodes, Semiconductor
Languages : en
Pages : 290
View: 951

Get Book


Chirp And Linewidth Characteristics In Semiconductor Quantum Dot Lasers

Chirp and Linewidth Characteristics in Semiconductor Quantum Dot Lasers PDF
Author: Hua Tan
Publisher:
ISBN:
Size: 52.98 MB
Format: PDF
Category :
Languages : en
Pages : 123
View: 1350

Get Book

Due to the three dimensional confinement for the carriers, quantum dot lasers are promised to have superior characteristics than quantum well lasers. The direct modulation is playing one of the key roles in ever increasing optical communications, so the characteristics of the semiconductor lasers are of great importance. In this dissertation, the chirp characteristics of the quantum dot lasers are under investigated in details. The spectrum characteristics of the quantum dot lasers are interpreted to understand the reduced thermal conductivity in InGaAs/GaAs quantum dot active region. A thermal conductive model is employed to quantitatively analyze the thermal conductivity in the quantum dots, which is about one order of magnitude less than that in the quantum well lasers. A gain model is built to analyze the dependence of linewidth enhancement factor on duty cycle in quantum dot lasers. Because of the unusual thermal sensitivity of quantum dot active regions, a range of linewidth enhancement factors, from positive, near-zero to negative, could be expected on different duty cycles. A symmetric gain distribution should be approached to achieve near-zero linewidth enhancement factor. 1.3 micron In(Ga)As/GaAs quantum dot DFB lasers fabricated by holography is demonstrated. Lloyd's mirror exposure system is used for the interference lithography. The laser structure is designed, the laser mode distribution is simulated, and the Bragg grating is analyzed. A single mode operation around 1.3 micron is realized in the DFB quantum dot lasers. In DFB lasers, on the shorter wavelength side of the peak gain, the spontaneous emission becomes significant and plays an important role in affecting the spectral linewidth, so care should be taken in using linewidth enhancement factor alone as figure-of-merit to describe the linewidth across the whole spectrum. Finally, the correlation of linewidth to distributed coefficient is discussed and effective facet reflectivity is modeled.

Numerical Modeling Of Narrow Linewidth Quantum Dot Lasers

Numerical Modeling of Narrow linewidth Quantum Dot Lasers PDF
Author: Bjelica, Marko
Publisher: kassel university press GmbH
ISBN: 3737602840
Size: 53.76 MB
Format: PDF
Category :
Languages : en
Pages : 135
View: 927

Get Book

The quantization of the active laser medium has enabled numerous advances in fiber-optic communications, e.g., higher efficiency of laser diodes, higher modulation bandwidth, lower spectral linewidth of the emitted signal. In recent years the quantum dot lasers have demonstrated a strong potential to continue this trend, therefore, by progressing from standard quantum well to quantum dot designs, it can be expected that the quantum dot lasers will play an increasingly important role in future fiber-optic communications. The research work presented in this dissertation seeks to further develop the quantum dot laser designs and improve the understanding of complex operating conditions affecting the laser linewidth. This is achieved by developing a comprehensive laser simulator, that was applied to design and simulation of edge-emitting lasers and laser arrays. As a result, the optimized laser diodes have demonstrated a significantly lower linewidth compared to equivalent quantum well designs. Due to their narrow linewidth, the realized photonic devices can be a viable solution for high bit rate fiber-optic networks.

Nonlinear Laser Dynamics

Nonlinear Laser Dynamics PDF
Author: Kathy Lüdge
Publisher: John Wiley & Sons
ISBN: 3527639837
Size: 58.32 MB
Format: PDF, Docs
Category : Science
Languages : en
Pages : 408
View: 6767

Get Book

A distinctive discussion of the nonlinear dynamical phenomena of semiconductor lasers. The book combines recent results of quantum dot laser modeling with mathematical details and an analytic understanding of nonlinear phenomena in semiconductor lasers and points out possible applications of lasers in cryptography and chaos control. This interdisciplinary approach makes it a unique and powerful source of knowledge for anyone intending to contribute to this field of research. By presenting both experimental and theoretical results, the distinguished authors consider solitary lasers with nano-structured material, as well as integrated devices with complex feedback sections. In so doing, they address such topics as the bifurcation theory of systems with time delay, analysis of chaotic dynamics, and the modeling of quantum transport. They also address chaos-based cryptography as an example of the technical application of highly nonlinear laser systems.

Ultrafast Lasers Based On Quantum Dot Structures

Ultrafast Lasers Based on Quantum Dot Structures PDF
Author: Edik U. Rafailov
Publisher: John Wiley & Sons
ISBN: 3527634495
Size: 66.74 MB
Format: PDF, ePub, Docs
Category : Science
Languages : en
Pages : 262
View: 3269

Get Book

In this monograph, the authors address the physics and engineering together with the latest achievements of efficient and compact ultrafast lasers based on novel quantum-dot structures and devices. Their approach encompasses a broad range of laser systems, while taking into consideration not only the physical and experimental aspects but also the much needed modeling tools, thus providing a holistic understanding of this hot topic.

The Physics And Engineering Of Compact Quantum Dot Based Lasers For Biophotonics

The Physics and Engineering of Compact Quantum Dot based Lasers for Biophotonics PDF
Author: Edik U. Rafailov
Publisher: John Wiley & Sons
ISBN: 3527665609
Size: 40.78 MB
Format: PDF, ePub
Category : Science
Languages : en
Pages : 264
View: 4143

Get Book

Written by a team of European experts in the field, this book addresses the physics, the principles, the engineering methods, and the latest developments of efficient and compact ultrafast lasers based on novel quantum-dot structures and devices, as well as their applications in biophotonics. Recommended reading for physicists, engineers, students and lecturers in the fields of photonics, optics, laser physics, optoelectronics, and biophotonics.