Long-wavelength (λ ≈ 16 [i]æ[/i]m), Room-temperature, Single-frequency Quantum-cascade Lasers Based on a Bound-to-continuum Transition PDF Download
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![Long-wavelength (λ ≈ 16 [i]æ[/i]m), Room-temperature, Single-frequency Quantum-cascade Lasers Based on a Bound-to-continuum Transition PDF](https://books.google.com/books/content/images/frontcover/L0rmjgEACAAJ?fife=w80-h100)
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Author: Jérôme Faist
Publisher: Oxford University Press
ISBN: 0198528248
Category : Science
Languages : en
Pages : 321
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This book describes the physics, fabrication technology, and applications of the quantum cascade laser.
Author: Kevin Michael Oresick
Publisher:
ISBN:
Category :
Languages : en
Pages : 143
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Quantum cascade lasers (QCLs) are semiconductor lasers that emit in the mid- to far-infrared and employ intersubband transitions in multiple quantum-well structures. Conventionally, the active region of QCLs has consisted of quantum wells and barriers of fixed-alloy composition. That has led to severe carrier leakage from the upper-laser level and injector states, evidenced by strong temperature dependences of the device characteristics, which resulted in low values for wall-plug efficiency [eta]wp of CW-operating devices. We have devised in the past means for carrier-leakage suppression, and have recently derived a comprehensive carrier-leakage formalism that bridges the gap between theoretical and experimental values for the internal efficiency. Here we present a refinement of the comprehensive carrier-leakage formalism and employ it for comparing our band-engineered ~ 8 [mu]m-emitting QCL, so-called step-tapered active-region (STA), to a conventional ~ 8 [mu]m-emitting QCL. We find that the internal efficiency reaches a high value of ~ 73.6%, due to record-high injection- and laser-transition efficiencies. Experimentally we obtain a single-facet [eta]wp value of 10.6%, a record-high value for 8-11 Îơm-emitting QCLs grown by MOCVD. Then, by using both band- and interface-roughness (IFR)-scattering - engineering we designed an optimized 8.2 [mu]m-emitting STA-QCL that reaches a record-high injection efficiency of 89.5%. By minimizing the waveguide loss and raising the doping level the device reaches a record-high internal efficiency (80%) for ~ 8 [mu]m-emitting QCLs as well as a projected [eta]wp value of 11.2%. The studies are extended to devices of higher layer-interface quality, grown by two different techniques. As a result, we obtain [eta]wp values as high as 15.6 %. In addition, the optimized STA-QCL has a lower-level lifetime dominated by IFR scattering, which makes it amenable to further optimization via IFR engineering. Finally, we analyze an ~ 8 [mu]m-emitting QCLs that holds the world record [eta]wp value, primarily due to low voltages via the realization of photon-induced carrier transport. We find that the device has significant carrier leakage, and show that our optimized STA QCL can reach comparable [eta]wp values if high-quality interfaces are employed. We then derive ultimate limits for the [eta]wp value in the 7-11 [mu]m wavelength range.
Author: Joseph D. Bennett
Publisher: Nova Science Publishers
ISBN: 9781536103878
Category : Heterostructures
Languages : en
Pages : 0
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Quantum cascade lasers (QCLs) are unipolar devices with lasing occurring through transitions between quantised energy levels within the conduction band. When compared to conventional lasers (e.g. gas, liquid or solid state lasers), these new optoelectronic devices present a fundamental advantage that resides in their ability to tailor the wavelength of the emitted light via the layer thickness rather than the band gap. This book discusses different types and applications of quantum cascade lasers.
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: Christoph Walther
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
ISBN: 9783838128573
Category :
Languages : en
Pages : 244
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Quantum cascade lasers are unipolar semiconductor lasers based on intersubband transitions in quantum wells. They have shown laser operation from above 100 THz down to the terahertz region and are promising sources for the terahertz region (0.3-10 THz) which is lacking of efficient narrowband radiation sources. A low frequency quantum cascade laser design is developed that faces the emerging challenges when the photon energy approaches the broadening of the energy levels. A record lowest operation frequency of 1.2 THz is demonstrated. A hybrid laser-oscillator for the terahertz is developed in the second part of this work, consisting of an optical gain medium and an electronic resonator. The resonator is an inductor-capacitor resonant circuit. The so called circuit based laser has the property of being a deep sub-wavelength sized microcavity laser. The effective mode volume is among the smallest for electrically pumped lasers. The circuit based resonator in combination with an active region could lead to a class of new devices to generate and manipulate terahertz radiation that exploit cavity quantum electrodynamic effects.
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Author: Jochen Ulrich
Publisher:
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Languages : en
Pages : 157
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Author: Fardeen Fraser Mackenzie
Publisher:
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Category : Electronics
Languages : en
Pages :
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