Spectroscopic Applications Of Terahertz Quantum Cascade Lasers

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Spectroscopic Applications of Terahertz Quantum-Cascade Lasers

Tasmim Alam
Spectroscopic Applications of Terahertz Quantum Cascade Lasers Book PDF

Author : Tasmim Alam
Publisher : Cuvillier Verlag
Page : 132 pages
File Size : 50,7 Mb
Release : 2020-10-29
Category : Science
ISBN : 9783736962972

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Spectroscopic Applications of Terahertz Quantum-Cascade Lasers by Tasmim Alam Pdf

Quantum cascade lasers (QCLs) are attractive for high-resolution spectroscopy because they can provide high power and a narrow linewidth. They are particularly promising in the terahertz (THz) range since they can be used as local oscillators for heterodyne detection as well as transmitters for direct detection. However, THz QCL-based technologies are still under development and are limited by the lack of frequency tunability as well as the frequency and output power stability for free-running operation. In this dissertation, frequency tuning and linewidth of THz QCLs are studied in detail by using rotational spectroscopic features of molecular species. In molecular spectroscopy, the Doppler eff ect broadens the spectral lines of molecules in the gas phase at thermal equilibrium. Saturated absorption spectroscopy has been performed that allows for sub-Doppler resolution of the spectral features. One possible application is QCL frequency stabilization based on the Lamb dip. Since the tunability of the emission frequency is an essential requirement to use THz QCL for high-resolution spectroscopy, a new method has been developed that relies on near-infrared (NIR) optical excitation of the QCL rear-facet. A wide tuning range has been achieved by using this approach. The scheme is straightforward to implement, and the approach can be readily applied to a large class of THz QCLs. The frequency and output stability of the local oscillator has a direct impact on the performance and consistency of the heterodyne spectroscopy. A technique has been developed for a simultaneous stabilization of the frequency and output power by taking advantage of the frequency and power regulation by NIR excitation. The results presented in this thesis will enable the routine use of THz QCLs for spectroscopic applications in the near future.

Mid-Infrared and Terahertz Quantum Cascade Lasers

Dan Botez,Mikhail A. Belkin
Mid Infrared and Terahertz Quantum Cascade Lasers Book PDF

Author : Dan Botez,Mikhail A. Belkin
Publisher : Cambridge University Press
Page : 551 pages
File Size : 49,8 Mb
Release : 2023-06-30
Category : Science
ISBN : 9781108427937

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Mid-Infrared and Terahertz Quantum Cascade Lasers by Dan Botez,Mikhail A. Belkin Pdf

A state-of-the-art overview of this rapidly expanding field, featuring fundamental theory, practical applications, and real-life examples.

Physics and Applications of Terahertz Radiation

Matteo Perenzoni,Douglas J. Paul
Physics and Applications of Terahertz Radiation Book PDF

Author : Matteo Perenzoni,Douglas J. Paul
Publisher : Springer
Page : 257 pages
File Size : 41,9 Mb
Release : 2013-10-16
Category : Science
ISBN : 9789400738379

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Physics and Applications of Terahertz Radiation by Matteo Perenzoni,Douglas J. Paul Pdf

This book covers the latest advances in the techniques employed to manage the THz radiation and its potential uses. It has been subdivided in three sections: THz Detectors, THz Sources, Systems and Applications. These three sections will allow the reader to be introduced in a logical way to the physics problems of sensing and generation of the terahertz radiation, the implementation of these devices into systems including other components and finally the exploitation of the equipment for real applications in some different field. All of the sections and chapters can be individually addressed in order to deepen the understanding of a single topic without the need to read the whole book. The THz Detectors section will address the latest developments in detection devices based on three different physical principles: photodetection, thermal power detection, rectification. The THz Sources section will describe three completely different generation methods, operating in three separate scales: quantum cascade lasers, free electron lasers and non-linear optical generation. The Systems and Applications section will take care of introducing many of the aspects needed to move from a device to an equipment perspective: control of terahertz radiation, its use in imaging or in spectroscopy, potential uses in security, and will address also safety issues. The text book is at a level appropriate to graduate level courses up to researchers in the field who require a reference book covering all aspects of terahertz technology.

Terahertz Spectroscopy

Jamal Uddin
Terahertz Spectroscopy Book PDF

Author : Jamal Uddin
Publisher : BoD – Books on Demand
Page : 320 pages
File Size : 55,7 Mb
Release : 2017-03-13
Category : Technology & Engineering
ISBN : 9789535130314

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Terahertz Spectroscopy by Jamal Uddin Pdf

The terahertz regime of the electromagnetic spectrum was largely unexplored due to the lack of technology needed to generate and detect the radiation. However, in the last couple of decades, there has been a dramatic increase in tools needed to harness the radiation. This remarkable progress made in the development of terahertz sources, components, and detectors has resulted in an ever-increasing inquisitiveness of the applications of terahertz technology in a wide range of fields including medicine, pharmaceuticals, security, sensing, and quality assurance. This book, Terahertz Spectroscopy - A Cutting Edge Technology, presents an overview of the recent advances in terahertz technology and their application in a vast array of fields. The scientists and students are encouraged to read and share the content of this volume. The book also provides a good starting point for researchers who are new to the terahertz regime. The various chapters of the book have been written by renowned scientists in different parts of the world who are at the forefront of terahertz research fields. It is our (InTech publisher, editor, and authors) hope that this book will enhance knowledge and stimulate more interest and future research in terahertz technology.

Concepts and Applications of Nonlinear Terahertz Spectroscopy

Thomas Elsaesser,Klaus Reimann,Michael Woerner
Concepts and Applications of Nonlinear Terahertz Spectroscopy Book PDF

Author : Thomas Elsaesser,Klaus Reimann,Michael Woerner
Publisher : Morgan & Claypool Publishers
Page : 159 pages
File Size : 44,5 Mb
Release : 2019-02-22
Category : Science
ISBN : 9781643272160

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Concepts and Applications of Nonlinear Terahertz Spectroscopy by Thomas Elsaesser,Klaus Reimann,Michael Woerner Pdf

Terahertz (THz) radiation with frequencies between 100 GHz and 30 THz has developed into an important tool of science and technology, with numerous applications in materials characterization, imaging, sensor technologies, and telecommunications. Recent progress in THz generation has provided ultrashort THz pulses with electric field amplitudes of up to several megavolts/cm. This development opens the new research field of nonlinear THz spectroscopy in which strong light-matter interactions are exploited to induce quantum excitations and/or charge transport and follow their nonequilibrium dynamics in time-resolved experiments. This book introduces methods of THz generation and nonlinear THz spectroscopy in a tutorial way, discusses the relevant theoretical concepts, and presents prototypical, experimental, and theoretical results in condensed matter physics. The potential of nonlinear THz spectroscopy is illustrated by recent research, including an overview of the relevant literature.

Mid-Infrared and Terahertz Quantum Cascade Lasers

Dan Botez,Mikhail A. Belkin
Mid Infrared and Terahertz Quantum Cascade Lasers Book PDF

Author : Dan Botez,Mikhail A. Belkin
Publisher : Cambridge University Press
Page : 552 pages
File Size : 45,9 Mb
Release : 2023-09-14
Category : Technology & Engineering
ISBN : 9781108570602

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Mid-Infrared and Terahertz Quantum Cascade Lasers by Dan Botez,Mikhail A. Belkin Pdf

Learn how the rapidly expanding area of mid-infrared and terahertz photonics has been revolutionized in this comprehensive overview. State-of-the-art practical applications are supported by real-life examples and expert guidance. Also featuring fundamental theory enabling you to improve performance of both existing and future devices.

Optimization of a Quantum Cascade Laser Operating in the Terahertz Frequency Range Using a Multiobjective Evolutionary Algorithm

Traci A. Keller
Optimization of a Quantum Cascade Laser Operating in the Terahertz Frequency Range Using a Multiobjective Evolutionary Algorithm Book PDF

Author : Traci A. Keller
Publisher : Unknown
Page : 125 pages
File Size : 41,5 Mb
Release : 2004-06-01
Category : Lasers
ISBN : 1423519337

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Optimization of a Quantum Cascade Laser Operating in the Terahertz Frequency Range Using a Multiobjective Evolutionary Algorithm by Traci A. Keller Pdf

A quantum cascade (QC) laser is a specific type of semiconductor laser that operates through principles of quantum mechanics. In less than a decade QC lasers are already able to outperform previously designed double heterostructure semiconductor lasers. Because there is a genuine lack of compact and coherent devices which can operate in the far-infrared region the motivation exists for designing a terahertz QC laser. A device operating at this frequency is expected to be more efficient and cost effective than currently existing devices. It has potential applications in the fields of spectroscopy, astronomy, medicine and free-space communication as well as applications to near-space radar and chemical/biological detection. The overarching goal of this research was to find QC laser parameter combinations which can be used to fabricate viable structures. To ensure operation in the THz region the device must conform to the extremely small energy level spacing range from Æ10-15 meV. The time and expense of the design and production process is prohibitive, so an alternative to fabrication was necessary. To accomplish this goal a model of a QC laser, developed at Worchester Polytechnic Institute with sponsorship from the Air Force Research Laboratory Sensors Directorate, and the General Multiobjective Parallel Genetic Algorithm (GenMOP), developed at the Air Force Institute of Technology, were integrated to form a computer simulation which stochastically searches for feasible solutions.

Modern Techniques of Spectroscopy

Dheeraj Kumar Singh,Manik Pradhan,Arnulf Materny
Modern Techniques of Spectroscopy Book PDF

Author : Dheeraj Kumar Singh,Manik Pradhan,Arnulf Materny
Publisher : Springer Nature
Page : 663 pages
File Size : 54,9 Mb
Release : 2021-04-01
Category : Technology & Engineering
ISBN : 9789813360846

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Modern Techniques of Spectroscopy by Dheeraj Kumar Singh,Manik Pradhan,Arnulf Materny Pdf

The book highlights recent developments in the field of spectroscopy by providing the readers with an updated and high-level of overview. The focus of this book is on the introduction to concepts of modern spectroscopic techniques, recent technological innovations in this field, and current examples of applications to molecules and materials relevant for academia and industry. The book will be beneficial to researchers from various branches of science and technology, and is intended to point them to modern techniques, which might be useful for their specific problems. Spectroscopic techniques, that are discussed include, UV-Visible absorption spectroscopy, XPS, Raman spectroscopy, SERS, TERS, CARS, IR absorption spectroscopy, SFG, LIBS, Quantum cascade laser (QCL) spectroscopy, fluorescence spectroscopy, ellipsometry, cavity-enhanced absorption spectroscopy, such as cavity ring-down spectroscopy (CRDS) and evanescent wave-CRDS both in gas and condensed phases, time-resolved spectroscopy etc. Applications introduced in the different chapters demonstrates the usefulness of the spectroscopic techniques for the characterization of fundamental properties of molecules, e.g. in connection with environmental impact, bio-activity, or usefulness for pharmaceutical drugs, and materials important e.g. for nano-science, nuclear chemistry, or bio-applications. The book presents how spectroscopic techniques can help to better understand substances, which have also great impact on questions of social and economic relevance (environment, alternative energy, etc.).

Terahertz Technology

Ali Rostami,Hassan Rasooli,Hamed Baghban
Terahertz Technology Book PDF

Author : Ali Rostami,Hassan Rasooli,Hamed Baghban
Publisher : Springer Science & Business Media
Page : 256 pages
File Size : 42,5 Mb
Release : 2010-11-25
Category : Technology & Engineering
ISBN : 9783642157936

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Terahertz Technology by Ali Rostami,Hassan Rasooli,Hamed Baghban Pdf

The book presents information about Terahertz science, Terahertz photodetectors and Terahertz Lasers. A special emphasis is given to room temperature operation of long wavelength photodetectors based on novel quantum dots (Centered Defect Spherical Quantum Dots). Moreover, a complete analysis of systems based on Quantum Cascade structures to detect far infrared wavelengths is provided. Finally, the book presents Terahertz laser principles considering multi-color lasers in this range of wavelengths. Written as a background for graduate students in the Optics field.

Terahertz and Mid Infrared Radiation

Mauro F. Pereira,Oleksiy Shulika
Terahertz and Mid Infrared Radiation Book PDF

Author : Mauro F. Pereira,Oleksiy Shulika
Publisher : Springer
Page : 202 pages
File Size : 46,9 Mb
Release : 2011-02-26
Category : Science
ISBN : 9789400707696

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Terahertz and Mid Infrared Radiation by Mauro F. Pereira,Oleksiy Shulika Pdf

Terahertz (THz) and Mid-Infrared (MIR) radiation (TERA-MIR) can be transmitted through nearly any material without causing biological harm. Novel and rapid methods of detection can be created with devices operation in these spectral ranges allowing scanning for weapons, detecting hidden explosives (including plastic landmines), controlling the quality of food and a host of other exciting applications. This book focuses on mathematical and physical aspects of the field, on unifying these two spectral domains (THz and MIR) with regard to common sources, detectors, materials and applications, and on key interdisciplinary topics. The main THz and MIR source is the quantum cascade laser (QCL). Thus significant attention is paid to the challenge of turning this advanced technology into affordable commercial devices so as to exploit its enormous potential. However other alternatives to THz QCLs are also presented, e.g. sub-terahertz imaging from avalanching GaAs bipolar transistors, Josephson junctions as THz sources, semiconductor materials for pulsed THz sources, superconducting THz electronics with Josephson vortices. In summary this book delivers a global picture of the state of the art in TERA-MIR generation, detection and applications.

Handbook of Terahertz Technologies

Ho-Jin Song,Tadao Nagatsuma
Handbook of Terahertz Technologies Book PDF

Author : Ho-Jin Song,Tadao Nagatsuma
Publisher : CRC Press
Page : 612 pages
File Size : 43,5 Mb
Release : 2015-04-15
Category : Science
ISBN : 9789814613095

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Handbook of Terahertz Technologies by Ho-Jin Song,Tadao Nagatsuma Pdf

Terahertz waves, which lie in the frequency range of 0.1–10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has triggered the search for new uses of terahertz waves in many fields, such as bioscience, security, and information and communications technology. The book covers some of the technical breakthroughs in terms of device technologies. It discusses not only the theoretical details and typical features of the technology described, but also some issues and challenges related to it. In addition, it is shown what can actually be done with the terahertz-wave technologies by introducing several successful demonstrations, such as wireless communications, industrial uses, remote sensing, chemical analysis, and 2D/3D imaging.

Terahertz Frequency Detection and Identification of Materials and Objects

R.E. Miles,X.-C. Zhang,H. Eisele,A. Krotkus
Terahertz Frequency Detection and Identification of Materials and Objects Book PDF

Author : R.E. Miles,X.-C. Zhang,H. Eisele,A. Krotkus
Publisher : Springer Science & Business Media
Page : 365 pages
File Size : 51,6 Mb
Release : 2007-09-08
Category : Technology & Engineering
ISBN : 9781402065033

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Terahertz Frequency Detection and Identification of Materials and Objects by R.E. Miles,X.-C. Zhang,H. Eisele,A. Krotkus Pdf

Want an overview of where the technology of terahertz detection has been going? Here it is. The technology has largely been developed around expensive and bulky femtosecond laser systems but, as described in this book, advances in semiconductor superlattice technology are leading to compact "electronic" sources such as the quantum cascade laser, two-terminal "Gunn" type oscillators and even a THz frequency amplifier. These advances towards electronic (as opposed to optical) THz systems mean that the technology will become portable and much less costly.

THz and Security Applications

Carlo Corsi,Fedir Sizov
THz and Security Applications Book PDF

Author : Carlo Corsi,Fedir Sizov
Publisher : Springer
Page : 317 pages
File Size : 53,8 Mb
Release : 2014-05-06
Category : Science
ISBN : 9789401788281

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THz and Security Applications by Carlo Corsi,Fedir Sizov Pdf

These proceedings comprise invited papers from highly experienced researchers in THz technology and security applications. THz detection of explosives represents one of the most appealing technologies to have recently emerged in dealing with terrorist attacks encountered by civil security and military forces throughout the world. Discussed are the most advanced technologies and developments, the various points of operational strength and weaknesses as well as are suggestions and predictions the best technological solutions to overcome current operational limits. The current status of various levels of cooling in THz detectors, sources and associated electronics are also addressed. The goal was to provide a clear view on the current technologies available and the required advances needed in order to achieve more efficient systems. This goal was outlined in part by establishing the baseline of current uncertainty estimations in physics-based modelling and the identification of key areas which require additional research and development.

Frontiers in Optics and Photonics

Federico Capasso,Dennis Couwenberg
Frontiers in Optics and Photonics Book PDF

Author : Federico Capasso,Dennis Couwenberg
Publisher : Walter de Gruyter GmbH & Co KG
Page : 783 pages
File Size : 45,8 Mb
Release : 2021-06-08
Category : Technology & Engineering
ISBN : 9783110710687

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Frontiers in Optics and Photonics by Federico Capasso,Dennis Couwenberg Pdf

This book provides a cutting-edge research overview on the latest developments in the field of Optics and Photonics. All chapters are authored by the pioneers in their field and will cover the developments in Quantum Photonics, Optical properties of 2D Materials, Optical Sensors, Organic Opto-electronics, Nanophotonics, Metamaterials, Plasmonics, Quantum Cascade lasers, LEDs, Biophotonics and biomedical photonics and spectroscopy.

Nonlinear Photonics in Mid-infrared Quantum Cascade Lasers

Louise Jumpertz
Nonlinear Photonics in Mid infrared Quantum Cascade Lasers Book PDF

Author : Louise Jumpertz
Publisher : Springer
Page : 134 pages
File Size : 54,9 Mb
Release : 2017-08-31
Category : Science
ISBN : 9783319658797

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Nonlinear Photonics in Mid-infrared Quantum Cascade Lasers by Louise Jumpertz Pdf

This thesis presents the first comprehensive analysis of quantum cascade laser nonlinear dynamics and includes the first observation of a temporal chaotic behavior in quantum cascade lasers. It also provides the first analysis of optical instabilities in the mid-infrared range. Mid-infrared quantum cascade lasers are unipolar semiconductor lasers, which have become widely used in applications such as gas spectroscopy, free-space communications or optical countermeasures. Applying external perturbations such as optical feedback or optical injection leads to a strong modification of the quantum cascade laser properties. Optical feedback impacts the static properties of mid-infrared Fabry–Perot and distributed feedback quantum cascade lasers, inducing power increase; threshold reduction; modification of the optical spectrum, which can become either single- or multimode; and enhanced beam quality in broad-area transverse multimode lasers. It also leads to a different dynamical behavior, and a quantum cascade laser subject to optical feedback can oscillate periodically or even become chaotic. A quantum cascade laser under external control could therefore be a source with enhanced properties for the usual mid-infrared applications, but could also address new applications such as tunable photonic oscillators, extreme events generators, chaotic Light Detection and Ranging (LIDAR), chaos-based secured communications or unpredictable countermeasures.