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Author : Longqi Zhou
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Fabrication, Characterisation and Applications of Mid-infrared Quantum Cascade Lasers written by Longqi Zhou and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Luyao Xu
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (863 download)
Download or read book Mid-infrared Quantum Cascade Lasers Modeling, Fabrication and Characterization written by Luyao Xu and published by . This book was released on 2013 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past 20 years, mid-infrared Quantum Cascade Lasers (mid-IR QCLs) have been experiencing rapid development and have become practical mid-IR sources for a variety of applications. There is particular technological interest in high efficiency lasers designed for the midwave infrared (MWIR) atmospheric window (3-5 [mu]m) and longwave infrared (LWIR) atmospheric window (8-13 [mu]m). This work presents a systematic study over mid-IR QCLs, including theoractical modeling, device fabrication and characterization. An effective bandstructure calculation method is implemented in this work for active region modeling. A standard process for fabricating mid-IR QCLs has been developed, based on which both LWIR (~ 9 [mu]m) and MWIR (~ 4 [mu]m) QCLs have been successfully demonstrated. Comprehensive testing results are analyzed and discussed, yielding valuable information about the current device design.
Author : David Patrick Burghoff
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (599 download)
Download or read book Characterization of Mid-infrared Quantum Cascade Lasers written by David Patrick Burghoff and published by . This book was released on 2009 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum cascade lasers provide some of the highest output powers available for light in the mid-infrared range (from 3 to 8 m). As many of their applications require portability, designs that have a high wall-plug efficiency are essential, and were designed and grown by others to achieve this goal. However, because a large fraction of these devices did not operate at all, very few of the standard laser measurements could be performed to determine their properties. Therefore, measurements needed to be performed that could non-destructively probe the behavior of QCLs while still providing useful information. This thesis explores these types of measurements, all of which fall into the category of device spectroscopy. Through polarization-dependent transmission and photovoltaic spectroscopy, a large portion of the quantum mechanical bandstructure could be determined, along with many of the parameters characterizing crystal growth quality. In addition, high-resolution transmission spectroscopy was used to find the properties of the QCL waveguide. In order to find the correspondence between theory and experiment, bandstructure simulations were performed using a three-band p model, and two-dimensional electromagnetic simulations were performed to describe the laser's optical properties. These simulations were found to be in relatively good agreement with the device measurements, and any discrepancies were found to be consistent with problems in the growth and fabrication.
Author : Xing Chen
Publisher :
ISBN 13 :
Total Pages : 364 pages
Book Rating : 4.:/5 (917 download)
Download or read book High Power Mid-infrared Quantum Cascade Laser Array for Standoff Photoacoustic Chemical Detection written by Xing Chen and published by . This book was released on 2013 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum cascade lasers (QCLs) are compact, portable, powerful semiconductor laser sources with emission wavelengths from mid-infrared (mid-IR) to terahertz (THz) regions of the electromagnetic spectrum. Mid-IR (i.e. wavelengths from 3 to 20 μm) QCLs are of great importance in a wide range of applications such as trace gas sensing, environmental monitoring, free space communication, medical diagnosis and so on. High power QCLs are particularly important to applications such as infrared counter measure (IRCM) and standoff chemical detections. In such applications, the system performances critically depend on the amount of power a QCL can produce. This dissertation includes two major studies: the first part of the dissertation includes design, fabrication and characterization of high power mid-IR QCL arrays; the second part involves standoff chemical detection using QCLs as laser sources and photoacoustic effect as sensing technologies.
Author : Jérôme Faist
Publisher : Oxford University Press
ISBN 13 : 0198528248
Total Pages : 321 pages
Book Rating : 4.1/5 (985 download)
Download or read book Quantum Cascade Lasers written by Jérôme Faist and published by Oxford University Press. This book was released on 2013-03-14 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the physics, fabrication technology, and applications of the quantum cascade laser.
Author : Xiaoliang He
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (112 download)
Download or read book Characterization and Theoretical Study of Mid-infrared Quantum Cascade Lasers written by Xiaoliang He and published by . This book was released on 2019 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Olivier Spitz
Publisher : Springer Nature
ISBN 13 : 3030743071
Total Pages : 179 pages
Book Rating : 4.0/5 (37 download)
Download or read book Mid-infrared Quantum Cascade Lasers for Chaos Secure Communications written by Olivier Spitz and published by Springer Nature. This book was released on 2021-05-15 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mid-infrared domain is a promising optical domain because it holds two transparency atmospheric windows, as well as the fingerprint of many chemical compounds. Quantum cascade lasers (QCLs) are one of the available sources in this domain and have already been proven useful for spectroscopic applications and free-space communications. This thesis demonstrates how to implement a private free-space communication relying on mid-infrared optical chaos and this requires an accurate cartography of non-linear phenomena in quantum cascade lasers. This private transmission is made possible by the chaos synchronization of two twin QCLs. Chaos in QCLs can be generated under optical injection or external optical feedback. Depending on the parameters of the optical feedback, QCLs can exhibit several non-linear phenomena in addition to chaos. Similarities exist between QCLs and laser diodes when the chaotic dropouts are synchronized with an external modulation, and this effect is known as the entrainment phenomenon. With a cross-polarization reinjection technique, QCLs can generate all-optical square-waves. Eventually, it is possible to trigger optical extreme events in QCLs with tilted optical feedback. All these experimental results allow a better understanding of the non-linear dynamics of QCLs and will extend the potential applications of this kind of semiconductor lasers.
Author : Alfredo Bismuto
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783846588376
Total Pages : 208 pages
Book Rating : 4.5/5 (883 download)
Download or read book Mid-Infrared Quantum Cascade Lasers written by Alfredo Bismuto and published by LAP Lambert Academic Publishing. This book was released on 2012-02 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work describes the work performed by the author at the ETH Zurich, under the supervision of Prof. Jerome Faist on the optimization of high performance quantum cascade lasers (QCLs) in the Mid-IR spectral region. The main factors influencing laser performance have therefore been analyzed. In particular the optimization of the laser design in order to improve the electron tranport and the optical gain. In addition a detailed analysis of the fabrication process is performed and a novel process scheme is presented for buried heterostructure lasers.
Author : Louise Jumpertz
Publisher : Springer
ISBN 13 : 3319658794
Total Pages : 152 pages
Book Rating : 4.3/5 (196 download)
Download or read book Nonlinear Photonics in Mid-infrared Quantum Cascade Lasers written by Louise Jumpertz and published by Springer. This book was released on 2017-08-31 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Sylvain Mathonnière
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (119 download)
Download or read book Design and Fabrication of Long Wavelength Mid-infrared Quantum Cascade Laser written by Sylvain Mathonnière and published by . This book was released on 2019* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Сутчи Тевье ; Стемпеню written by and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zeila Zanolli
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (14 download)
Download or read book Design, Fabrication and Study of GaAs-based Mid-IR Quantum Cascade Lasers written by Zeila Zanolli and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tianyi Zeng
Publisher :
ISBN 13 :
Total Pages : 105 pages
Book Rating : 4.:/5 (12 download)
Download or read book Long-wave Infrared Frequency Combs Based on Quantum Cascade Lasers written by Tianyi Zeng and published by . This book was released on 2017 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever since the invention of quantum cascade laser (QCL), the performance and the flexibility in design has made it a desirable source for a wide range of applications, such as trace-chemical sensing, health monitoring, frequency metrology, noninvasive imgaing and infrared countermeasures. The LWIR region (or mid-infrared region), roughly ranging from 2-20 [mu]m, is of particular importance to spectroscopy applications, since many molecular species have their strongest rotational-vibrational absorption bands in that area. Infrared laser spectroscopy began about 40 years ago and has been using a variety of different tunable laser-based sources, particularly lead salt diodes, color center lasers, difference frequency generation and optical parametric oscillators. The large tunabilitiy in the design (lasing frequency, tunability, power, material system, etc.) and the compactness in fabrication and packaging has made QCL an ideal source for laser-based spectroscopy. Traditional spectroscopy systems suffer from problems like large physical dimensions, long data-processing times and spectral resolution restrictions. Therefore the development of a simple, robust, compact and inexpensive optical source/system like QCL frequency combs can largely benefit spectroscopy systems. In the past few years, QCLs have proven to be able to form comb radiation in both LWIR and THz regions. And dual comb spectroscopy has been demonstrated using QCL frequency combs with very short acquisition time ([mu]s). The development of a broadband, high power, narrow linewidth and stable LWIR frequency comb based on quantum cascade laser is the key to realizing such broadband ultrafast spectrometer in the mid-infrared range. This thesis explores the design, fabrication and characterization techniques towards the development of LWIR QCL frequency comb devices for spectroscopic purposes. A complete wet etch epi-up fabrication process is reported, with preliminary results on the dry-etch technique to incorporate dispersion compensation strucutre and epi-down fabricaiton for high power CW mode QCL device. Formation of comb(-like) regime has been observed in two devices, with the Gires-Tournois Interferometer (GTI) mirror providing dispersion from the rear facet. In order to improve the comb performance of these devices, dispersion of the device is measured to provide essential information for the design of chirped top cladding for dispersion compensation. This thesis provides an important step towards the realization of a room temperature, broadband, CW mode LWIR QCL frequency comb device for spectroscopic purposes.
Download or read book Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Miriam Serena Vitiello
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (18 download)
Download or read book THz and Mid-IR Quantum Cascade Lasers and Light Emitting Devices written by Miriam Serena Vitiello and published by . This book was released on 2005 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Paul Commin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (857 download)
Download or read book Short Wavelength Quantum Cascade Lasers written by James Paul Commin and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum Cascade Lasers (QCLs) are unipolar lasers based on intersubband transitions that have emission wavelengths in the mid- to far-infrared. Mid-infrared QCLs have recently reached a high level of technological maturity with watt level continuous wave output powers being demonstrated at room temperature. However, the performance of these conventional QCLs falls away very rapidly below -4 urn where a number of important applications exist. This thesis details the design, fabrication and characterisation of high performance 'short wavelength' QCLs that operate in the 3-4 urn region. The high conduction band offset of the InGaAs/ AIAsSb material system and its compatibility with InP based waveguides and fabrication technology has made it the most attractive solution to achieving high performance QCLs in the 3-4 urn region. This thesis covers the development of InGaAs/AIAsSb based QCLs and covers the demonstration of a number of record high output powers and maximum operating temperatures. Watt level peak powers at room temperature and operation up to at least 400 K have been achieved across the -3.3-3.7 urn range. These high performance InGaAs/ AIAsSb lasers are well suited for the realization of single-mode devices that can be used to create compact, ultra-sensitive trace-gas sensors based on absorption spectroscopy. To this effect, single-mode distributed feedback (DFB) QCLs where developed at -3.35-3.45 urn with side mode suppression ratios of up to 30 dB. The lasers employed buried third order DFB gratings and operated at room temperature. Finally, the development of strain compensated InGaAs/AlInAs QCLs grown by metal- organic vapour phase epitaxy (MOVPE) is detailed. This growth technique presents significant advantages for commercial device production when compared to the more typically employed molecular beam epitaxy growth technique. MOVPE grown InGaAs/ AlInAs QCLs with 70% indium composition in the wells operating at -4 urn are reported.
Author : Dan Botez
Publisher : Cambridge University Press
ISBN 13 : 1108570607
Total Pages : 552 pages
Book Rating : 4.1/5 (85 download)
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.
