Distributed-feedback Quantum Cascade Lasers Emitting in the 9-[i]μ[/i]m Band with InP Top Cladding Layers PDF Download
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![Distributed-feedback Quantum Cascade Lasers Emitting in the 9-[i]μ[/i]m Band with InP Top Cladding Layers PDF](https://books.google.com/books/content/images/frontcover/4gcUjwEACAAJ?fife=w150-h200)
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![Distributed-feedback Quantum Cascade Lasers Emitting in the 9-[i]μ[/i]m Band with InP Top Cladding Layers PDF](https://books.google.com/books/content/images/frontcover/4gcUjwEACAAJ?fife=w80-h100)
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![Surface-emitting 10.1 [i]æ[/i]m Quantum-cascade Distributed Feedback Lasers PDF](https://books.google.com/books/content/images/frontcover/WHyLAQAACAAJ?fife=w80-h100)
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Author: Dan Botez
Publisher: Cambridge University Press
ISBN: 1108427936
Category : Science
Languages : en
Pages : 551
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A state-of-the-art overview of this rapidly expanding field, featuring fundamental theory, practical applications, and real-life examples.
Author: Benjamin Guocian Lee
Publisher:
ISBN: 9781109066906
Category :
Languages : en
Pages : 226
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Achieving overlapped beams at extended distances can be important for a number of applications envisioned for DFB-QCL arrays, particularly remote sensing. Using the technique of spectral beam combining, the total angular divergence of the DFB-QCL array was reduced to less than 2 milliradians, which is 40 times better than without beam combining. Using the beam-combined array, absorption spectroscopy was performed at a distance of 6 m from the laser chip. An ultra-broadband DFB-QCL array was developed to further increase the coverage and tuning range. The array emitted in a range over 220 cm -1 near 9 μm wavelength, operated pulsed at room temperature.
Author: Louise Jumpertz
Publisher: Springer
ISBN: 3319658794
Category : Science
Languages : en
Pages : 152
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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: Tsung-Yu Kao
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Languages : en
Pages : 114
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A new approach to achieve high-power, symmetric beam-pattern, single-mode THz emission from metal-metal waveguide quantum-cascade laser is proposed and implemented. Several surface-emitting distributed feedback terahertz lasers are coupled through the connection phase sectors between them. Through carefully choosing the length of phase sectors, each laser will be in-phase locked with each other and thus create a tighter beam-pattern along the phased-array direction. A clear proof of phase-locking phenomenon has been observed and the array can be operated in either in-phase or out-of-phase mode at different phase sector length. The phase sector can also be individually biased to provide another frequency tuning mechanism through gain-induced optical index change. A frequency tuning range of 1:5 GHz out of 3:9 THz was measured. Moreover, an electronically controlled "beam steering" device is also proposed based on the result of this work. This thesis focuses on the design, fabrication and measurement of the surface-emitting distributed feedback terahertz quantum-cascade phase-locked laser arrays.
Author: Mithun D'Souza
Publisher:
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Category :
Languages : en
Pages : 166
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![High-temperature Operation of Distributed Feedback Quantum-cascade Lasers at 5.3 [i]æ[/i]m PDF](https://books.google.com/books/content/images/frontcover/awkpnQAACAAJ?fife=w80-h100)
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Author: Anthony Matlis
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Languages : en
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Author: Olivier Spitz
Publisher: Springer Nature
ISBN: 3030743071
Category : Science
Languages : en
Pages : 179
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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.
