Download or read book Radio Frequency Modulation of Low Dissipation Distributed Feedback Quantum Cascade Lasers written by Borislav Hinkov and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Room Temperature Continuous Wave Operation of Distributed Feedback Quantum Cascade Lasers with Widely Spaced Operation Frequencies written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Bandwidth Direct Modulation of Distributed Feedback Quantum Well Lasers written by and published by . This book was released on 2000 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wide-bandwidth microwave modulation of semiconductor strained quantum-well lasers using distributed feedback structures plays an important role in high bit-rate optical communication systems. It is therefore critical to conduct research on the device physics of strained semiconductor quantum-well lasers under high-frequency modulation and on the creation of new techniques to characterize high-speed quantum-well lasers. The goals of this project are (1) to design and fabricate high bandwidth distributed feedback quantum- well lasers using strain effects and (2) to combine microwave and optical measurement techniques to investigate the physics and device performance of quantum-well lasers under high-speed modulation conditions. The project is interdisciplinary in nature since optoelectronic device technology, microwave and optical measurement techniques will be introduced to the study of high-frequency modulation of quantum-well lasers for optical communication systems.
Download or read book High frequency Modulation of a Quantum cascade Laser Using a Monolithically Integrated Intracavity Modulator written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a quantum-cascade laser monolithically integrated with an intracavity modulator which could be operated up to 1 GHz. In contrast to earlier approaches, where the radio frequency (RF) modulation signal was supplied to the entire cavity length of the laser structure, we drive only a relatively small 375-/spl mu/m-long section of the cavity. At the same time, a quasi-continuous-wave signal was supplied to the remaining 1125-/spl mu/m-long section. This modulation scheme resulted in smaller parasitic capacitance effects than what we reported previously, and enabled us to work with lower RF voltages and currents.
Download or read book Fabrication of Distributed Feedback Quantum Cascade Lasers written by Anthony Matlis and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distributed Feedback Quantum Cascade Lasers written by Werner Schrenk and published by . This book was released on 2001 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Average Power First order Distributed Feedback 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:
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.
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.
Download or read book Continuous wave Distributed feedback Quantum cascade Lasers on a Peltier Cooler written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High temperature Operation of Distributed Feedback Quantum cascade Lasers at 5 3 i i m written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distributed feedback Quantum Cascade Lasers Emitting in the 9 i i m Band with InP Top Cladding Layers written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wideband Modulation and Tuning of Semiconductor Lasers Using Novel Quantum Well Structures written by and published by . This book was released on 1994 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Angle modulation techniques enable analogue optical transmission systems to be realized which have dynamic ranges in excess of those possible with conventional intensity modulation direct detection (IMDD) links. Tunable semiconductor lasers are essential components for links employing optical frequency modulation (OFM) for enhanced dynamic range or dense wavelength division multiplex (DWDM) for multi-channel capability. They are also key components in many advanced sensor systems. Existing lasers use the forward bias carrier injection effect (CIE) to achieve tuning. Whilst this is a convenient technique for wavelength setting it suffers from severe limitations when fast tuning or modulation of the laser frequency is required. At low modulation frequencies the response is dominated by thermal effects, leading to a decrease in emission frequency with increasing carrier, whereas at high frequencies the response is dominated by plasma and band filling effects giving an increase in frequency with increasing current. The resulting overall frequency response typically vaiies by more than an order of magnitude from 0-1GHz accompanied by phase variations of up to pi radians. Equalizing such a response, even over a restricted frequency range, request complex networks that have to be optimized for the particular laser and its operating conditions. Improved uniformity of response has been obtained in multi- electrode distributed feedback (DFB) lasers by carefully adjusting the distribution of current between sections, but the high frequency response tends to be limited by current lifetime in the section biased below transparency to about 1GHz.
Download or read book Frequency Locking and Monitoring Based on Bi directional Terahertz Radiation of a 3rd order Distributed Feedback Quantum Cascade Laser written by and published by . This book was released on 2015 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we have performed frequency locking of a dual, forward reverse emitting third-order distributed feedback quantum cascade laser (QCL) at 3.5 THz. By using both directions of THz emission in combination with two gas cells and two power detectors, we can for the first time perform frequency stabilization, while monitor the frequency locking quality independently. We also characterize how the use of a less sensitive pyroelectric detector can influence the quality of frequency locking, illustrating experimentally that the sensitivity of the detectors is crucial. Using both directions of terahertz (THz) radiation has a particular advantage for the application of a QCL as a local oscillator, where radiation from one side can be used for frequency/phase stabilization, leaving the other side to be fully utilized as a local oscillator to pump a mixer.
Download or read book Stable Single Mode Operation of Quantum Cascade Lasers by Complex coupled Second order Distributed Feedback Grating written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of Surface Grating Distributed Feedback Quantum Cascade Laser for High Output Power and Low Threshold Current Density written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
