Spectroscopic Applications Of Terahertz Quantum Cascade Lasers

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Spectroscopic Applications of Terahertz Quantum-Cascade Lasers

Author : Tasmim Alam
Publisher : Cuvillier Verlag
ISBN 13 : 3736962975
Total Pages : 132 pages
Book Rating : 4.7/5 (369 download)

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Book Synopsis Spectroscopic Applications of Terahertz Quantum-Cascade Lasers by : Tasmim Alam

Download or read book Spectroscopic Applications of Terahertz Quantum-Cascade Lasers written by Tasmim Alam and published by Cuvillier Verlag. This book was released on 2020-10-29 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Terahertz Quantum-cascade Lasers for Spectroscopic Applications

Author : Benjamin Malte Röben
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Terahertz Quantum-cascade Lasers for Spectroscopic Applications by : Benjamin Malte Röben

Download or read book Terahertz Quantum-cascade Lasers for Spectroscopic Applications written by Benjamin Malte Röben and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Novel Applications of Terahertz Quantum Cascade Lasers

Author : Binbin Wei
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)

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Book Synopsis Novel Applications of Terahertz Quantum Cascade Lasers by : Binbin Wei

Download or read book Novel Applications of Terahertz Quantum Cascade Lasers written by Binbin Wei and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Physics and Applications of Terahertz Radiation

Author : Matteo Perenzoni
Publisher : Springer
ISBN 13 : 9400738374
Total Pages : 257 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Physics and Applications of Terahertz Radiation by : Matteo Perenzoni

Download or read book Physics and Applications of Terahertz Radiation written by Matteo Perenzoni and published by Springer. This book was released on 2013-10-16 with total page 257 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Author : Jamal Uddin
Publisher : BoD – Books on Demand
ISBN 13 : 9535130315
Total Pages : 320 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Terahertz Spectroscopy by : Jamal Uddin

Download or read book Terahertz Spectroscopy written by Jamal Uddin and published by BoD – Books on Demand. This book was released on 2017-03-13 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Fundamentals of Terahertz Devices and Applications

Author : Dimitris Pavlidis
Publisher : John Wiley & Sons
ISBN 13 : 1119460719
Total Pages : 580 pages
Book Rating : 4.1/5 (194 download)

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Book Synopsis Fundamentals of Terahertz Devices and Applications by : Dimitris Pavlidis

Download or read book Fundamentals of Terahertz Devices and Applications written by Dimitris Pavlidis and published by John Wiley & Sons. This book was released on 2021-08-02 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: An authoritative and comprehensive guide to the devices and applications of Terahertz technology Terahertz (THz) technology relates to applications that span in frequency from a few hundred GHz to more than 1000 GHz. Fundamentals of Terahertz Devices and Applications offers a comprehensive review of the devices and applications of Terahertz technology. With contributions from a range of experts on the topic, this book contains in a single volume an inclusive review of THz devices for signal generation, detection and treatment. Fundamentals of Terahertz Devices and Applications offers an exploration and addresses key categories and aspects of Terahertz Technology such as: sources, detectors, transmission, electronic considerations and applications, optical (photonic) considerations and applications. Worked examplesbased on the contributors extensive experience highlight the chapter material presented. The text is designed for use by novices and professionals who want a better understanding of device operation and use, and is suitable for instructional purposes This important book: Offers the most relevant up-to-date research information and insight into the future developments in the technology Addresses a wide-range of categories and aspects of Terahertz technology Includes material to support courses on Terahertz Technology and more Contains illustrative worked examples Written for researchers, students, and professional engineers, Fundamentals of Terahertz Devices and Applications offers an in-depth exploration of the topic that is designed for both novices and professionals and can be adopted for instructional purposes.

Quantum Cascade Lasers for Terahertz Applications

Author : Sudeep Khanal
Publisher :
ISBN 13 : 9781369637335
Total Pages : 241 pages
Book Rating : 4.6/5 (373 download)

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Book Synopsis Quantum Cascade Lasers for Terahertz Applications by : Sudeep Khanal

Download or read book Quantum Cascade Lasers for Terahertz Applications written by Sudeep Khanal and published by . This book was released on 2017 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mid-infrared (lambda ~ 3 -- 30 mum) and terahertz (THz) or far-infrared (lambda ~ 30 -- 300 mum) regions of the electromagnetic spectrum offer unique applications in spectroscopy, sensing, and imaging. However, these longer wavelengths (photon energies 0.4 eV) are difficult to generate with compact solid-state devices owing to the lack of naturally occurring materials with small bandgaps. Quantum-cascade lasers (QCLs) are unipolar devices based on semiconductor superlattices, in which radiation occurs due to intersubband (rather than interband) optical transitions.

Modern Techniques of Spectroscopy

Author : Dheeraj Kumar Singh
Publisher : Springer Nature
ISBN 13 : 9813360844
Total Pages : 663 pages
Book Rating : 4.8/5 (133 download)

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Book Synopsis Modern Techniques of Spectroscopy by : Dheeraj Kumar Singh

Download or read book Modern Techniques of Spectroscopy written by Dheeraj Kumar Singh and published by Springer Nature. This book was released on 2021-04-01 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.).

Towards Terahertz Dual-comb Spectroscopy Based on Quantum Cascade Lasers

Author :
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (941 download)

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Book Synopsis Towards Terahertz Dual-comb Spectroscopy Based on Quantum Cascade Lasers by :

Download or read book Towards Terahertz Dual-comb Spectroscopy Based on Quantum Cascade Lasers written by and published by . This book was released on 2015 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, terahertz (THz) laser frequency combs are improved and THz dual-comb spectroscopy method is demonstrated. To achieve better performance of THz quantum cascade laser (QCL) frequency combs, several broadband homogeneous and heterogeneous gain media are characterized, and corresponding dispersion compensators are designed. All THz QCL frequency combs are fabricated in Microsystems Technology Laboratories at MIT using our group's standard process. By utilizing the broad spectral coverage of THz QCL frequency combs and the multiheterodyne detection method, a prototype of the THz dual-comb spectrometer is demonstrated. This thesis work provides an important step towards realizing laser-based broadband THz spectroscopy system for chemical identification and explosive detection.

Mid-Infrared and Terahertz Quantum Cascade Lasers

Author : Dan Botez
Publisher : Cambridge University Press
ISBN 13 : 1108427936
Total Pages : 551 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Mid-Infrared and Terahertz Quantum Cascade Lasers by : Dan Botez

Download or read book Mid-Infrared and Terahertz Quantum Cascade Lasers written by Dan Botez and published by Cambridge University Press. This book was released on 2023-06-30 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art overview of this rapidly expanding field, featuring fundamental theory, practical applications, and real-life examples.

Magneto-spectroscopy and Development of Terahertz Quantum Cascade Lasers

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (631 download)

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Book Synopsis Magneto-spectroscopy and Development of Terahertz Quantum Cascade Lasers by :

Download or read book Magneto-spectroscopy and Development of Terahertz Quantum Cascade Lasers written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work we concentrate our efforts on the generation of laser emission at low THz frequencies (3-1 THz range) employing the quantum cascade technology. Quantum cascade (QC) lasers are unipolar semiconductor lasers based on intersubband transitions in quantum wells that cover a large portion of the Mid and Far Infrared electromagnetic spectrum. Two main research lines have been followed: (i) the development of quantum cascade lasers based on population inversion between parabolic subbands and (ii) the development of low frequency QC lasers based on a three-dimensional electron confinement induced by an external magnetic field. (i) : Gain and laser action have been demonstrated in different systems at frequencies of 3.4 3.6 THz exploiting bound-to-bound and bound-to-continuum optical transition. A QC laser emitting at 3.6 THz and based on a vertical transition and resonant tunneling in a single quantum well has been demonstrated. To overcome the limitations in performance of such a system, an heterostructure laser based on a bound-to-continuum transition has been developed. The structure was the first one to operate above the technologically important temperature of liquid nitrogen. With a further development of the bound-to-continuum design that includes lower state lifetime reduction by optical phonon emission, laser action was successfully achieved at 115 K.A study of different waveguide mechanisms suitable for different THz frequencies has also been carried out. (ii) : THz quantum cascade lasers based on the in-plane confinement introduced by a strong magnetic field applied perpendiculary to the plane of the layers have been developed. A model system based on large single quantum wells (50-60 nm wide) has been exploited to study this gain mechanism. Such an approach led to the extension of the frequency range of operation of QC lasers, with the demonstration of laser action at 1.39 THz (220 mm) which is the lowest frequency observed to-date for this kind of.

2021 International Semiconductor Conference (CAS)

Author : IEEE Staff
Publisher :
ISBN 13 : 9781665402491
Total Pages : pages
Book Rating : 4.4/5 (24 download)

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Book Synopsis 2021 International Semiconductor Conference (CAS) by : IEEE Staff

Download or read book 2021 International Semiconductor Conference (CAS) written by IEEE Staff and published by . This book was released on 2021-10-06 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The conference will highlight latest developments in micro and nanotechnologies, still maintaining the traditional connection with semiconductor electronics CAS 2021 provides a forum of debate on selected topics of scientific research and technological development and offer the participants a great opportunity for refreshing broad perspectives through invited papers, oral and poster presentations

Mid-Infrared and Terahertz Quantum Cascade Lasers

Author : Dan Botez
Publisher : Cambridge University Press
ISBN 13 : 1108570607
Total Pages : 552 pages
Book Rating : 4.1/5 (85 download)

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Book Synopsis Mid-Infrared and Terahertz Quantum Cascade Lasers by : Dan Botez

Download or read book Mid-Infrared and Terahertz Quantum Cascade Lasers written by Dan Botez and published by Cambridge University Press. This book was released on 2023-09-14 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Vertical External Cavity Surface Emitting Lasers

Author : Michael Jetter
Publisher : John Wiley & Sons
ISBN 13 : 3527807977
Total Pages : 584 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Vertical External Cavity Surface Emitting Lasers by : Michael Jetter

Download or read book Vertical External Cavity Surface Emitting Lasers written by Michael Jetter and published by John Wiley & Sons. This book was released on 2021-09-16 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vertical External Cavity Surface Emitting Lasers Provides comprehensive coverage of the advancement of vertical-external-cavity surface-emitting lasers Vertical-external-cavity surface-emitting lasers (VECSELs) emit coherent light from the infrared to the visible spectral range with high power output. Recent years have seen new device developments – such as the mode-locked integrated (MIXSEL) and the membrane external-cavity surface emitting laser (MECSEL) – expand the application of VECSELs to include laser cooling, spectroscopy, telecommunications, biophotonics, and laser-based displays and projectors. In Vertical External Cavity Surface Emitting Lasers: VECSEL Technology and Applications, leading international research groups provide a comprehensive, fully up-to-date account of all fundamental and technological aspects of vertical external cavity surface emitting lasers. This unique book reviews the physics and technology of optically-pumped disk lasers and discusses the latest developments of VECSEL devices in different wavelength ranges. Topics include OP-VECSEL physics, continuous wave (CW) lasers, frequency doubling, carrier dynamics in SESAMs, and characterization of nonlinear lensing in VECSEL gain samples. This authoritative volume: Summarizes new concepts of DBR-free and MECSEL lasers for the first time Covers the mode-locking concept and its application Provides an overview of the emerging concept of self-mode locking Describes the development of next-generation OPS laser products Vertical External Cavity Surface Emitting Lasers: VECSEL Technology and Applications is an invaluable resource for laser specialists, semiconductor physicists, optical industry professionals, spectroscopists, telecommunications engineers and industrial physicists.

Handbook of Terahertz Technologies

Author : Ho-Jin Song
Publisher : CRC Press
ISBN 13 : 9814613096
Total Pages : 606 pages
Book Rating : 4.8/5 (146 download)

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Book Synopsis Handbook of Terahertz Technologies by : Ho-Jin Song

Download or read book Handbook of Terahertz Technologies written by Ho-Jin Song and published by CRC Press. This book was released on 2015-04-15 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 trigg

Terahertz and Mid Infrared Radiation

Author : Mauro Pereira
Publisher : Springer Science & Business Media
ISBN 13 : 9400707681
Total Pages : 218 pages
Book Rating : 4.4/5 (7 download)

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Book Synopsis Terahertz and Mid Infrared Radiation by : Mauro Pereira

Download or read book Terahertz and Mid Infrared Radiation written by Mauro Pereira and published by Springer Science & Business Media. This book was released on 2011-02-26 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Hot Electrons in Semiconductors

Author : N. Balkan
Publisher :
ISBN 13 : 9780198500582
Total Pages : 536 pages
Book Rating : 4.5/5 (5 download)

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Book Synopsis Hot Electrons in Semiconductors by : N. Balkan

Download or read book Hot Electrons in Semiconductors written by N. Balkan and published by . This book was released on 1998 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under certain conditions electrons in a semiconductor become much hotter than the surrounding crystal lattice. When this happens, Ohm's Law breaks down: current no longer increases linearly with voltage and may even decrease. Hot electrons have long been a challenging problem in condensed matter physics and remain important in semiconductor research. Recent advances in technology have led to semiconductors with submicron dimensions, where electrons can be confined to two (quantum well), one (quantum wire), or zero (quantum dot) dimensions. In these devices small voltages heat electrons rapidly, inducing complex nonlinear behavior; the study of hot electrons is central to their further development. This book is the only comprehensive and up-to-date coverage of hot electrons. Intended for both established researchers and graduate students, it gives a complete account of the historical development of the subject, together with current research and future trends, and covers the physics of hot electrons in bulk and low-dimensional device technology. The contributions are from leading scientists in the field and are grouped broadly into five categories: introduction and overview; hot electron-phonon interactions and ultra-fast phenomena in bulk and two-dimensional structures; hot electrons in quantum wires and dots; hot electron tunneling and transport in superlattices; and novel devices based on hot electron transport.