Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 1077 for “"Lasers"”.
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Controlling molecules with lasers and lasers with molecules
… of spin in molecules using shaped ultrafast lasers and the dynamics of those lasers when their cavities are modified to include programmable molecular masks. The ability to control quantum phenomena has had several large successes over the last decade. This field, known as Quantum Control, …
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Holographic lasers
… the development of CW adaptive solid state lasers which dynamically correct for phase distortions within their cavity by phase conjugation. A fibre based four-wave mixing scheme is investigated but no experimental evidence of any phase conjugation is observed.
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Tapered waveguide lasers
… the design and fabrication of tapered waveguide lasers to allow efficient, high-power diode-pumping and produce diffraction-limited, near-symmetrical output, whilst maintaining a monolithic design compatible with integrated optical circuits. <br/><br/>The design rules required for efficient …
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Bipolar cascade lasers
… laser. BCLs consist of multiple single stage lasers electrically coupled via tunnel junctions. The BCL ideally operates by having each injected electron participate in a recombination event in the topmost active region, then tunnel from the valence band of the first active region into the …
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Integrable semiconductor ring lasers and two-dimensional rectangular lattice distributed feedback lasers
Two types of integrable semiconductor lasers are investigated in this thesis. Semiconductor ring lasers with circular and square ring resonators are analyzed, and their fabrications and laser results are described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and …
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High-power fibre lasers
… rare-earth (Yb3+, Er3+/Yb3+)-doped fibre lasers. Some of the main capabilities of fibre lasers such as: High brightness and thermal properties were exploited for the development of a variety of continuous wave (CW) and Q-switched devices, whose characteristics also includes compactness. …
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Semiconductor quantum dot lasers.
… than for two-dimensional quantum well (QW) lasers. At higher temperatures, the threshold current are governed mainly by the depth of the separate confinement region.
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Integrated Multiwavelength Semiconductor Lasers
… as in today's single-wavelength semiconductor lasers. By utilizing multiple sections of periodic structures, dual-wavelength InGaAs-GaAs ridge waveguide semiconductor lasers have been fabricated. Not only do these dual-wavelength lasers operate at predetermined wavelengths, but the wavelength …
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Single frequency semiconductor lasers
Single frequency semiconductor lasers are of interest for communication systems and spectroscopy. In communications, narrow linewidth is desirable to minimize dispersion effects and low cross-talk multiple wavelength channels on a single fiber. For GaAs-based lasers, the interest in narrow …
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Ultralow-noise modelocked lasers
… and theory of ultralow-noise actively modelocked lasers are presented. We demonstrate quantum-limited noise performance of a hybridly modelocked semiconductor laser with an rms timing jitter of only 47 fs (10 Hz to 10 MHz) and 86 fs (10 Hz to 4.5 GHz). The daunting task of measuring ultralow-noise …
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Terahertz quantum cascade lasers
… details the development of quantum cascade lasers (QCLs) that operate in the terahertz with photon energies below the semiconductor Reststrahlen band. Photons are emitted via electronic intersubband transitions that take place entirely within the conduction band, where the wavelength is …
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High-speed modulation of semiconductor lasers and properties of silver-coated quantum-dot lasers
… a great deal of research interest in plasmonic lasers, in which the optical field is confined by a metal waveguide instead of the more traditional dielectric waveguide. These devices show great promise because of their strong optical confinement and scalability below the diffraction limit. Both …
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Nd:YVO4 microchip lasers and amplifiers
… and simple single longitudinal mode laser. Such lasers (termed microchip lasers) have important applications in laser seeding, communications and frequency doubled micro-laser systems. The material has also been investigated as a compact optical amplifier.
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Vertical cavity surface emitting lasers.
Vertical cavity surface emitting laser (VCSEL) structures have been grown by both metal-organic chemical vapour deposition (MOCVD) and molecular beam epitaxy (MBE). These incorporate 3 strained InGaAs / GaAs quantum wells placed resonantly in a two wavelength long optical cavity, formed between …
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Solution-processable, mechanically-flexible lasers
… technology of solution-processed semiconductor lasers beyond the state-of-the-art and bring it closer to real-world implementation. An emphasis is put on the demonstration of mechanically-flexible lasers having low thresholds, high photostability and potential for cost-effectiveness and compact …
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Broadly tuneable crystalline Raman lasers
Here is presented the first demonstration of a continuous-wave third-Stokes crystalline Raman laser. This was achieved via intracavity Raman conversion of a vertical external cavity surface emitting laser (VECSEL), also known as a semiconductor disk laser (SDL). The VECSEL-pumped Raman laser …
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Electron-beam-pumped recombination lasers
… similar experimental conditions. Both of these lasers are believed to be predominantly pumped by recombination. For the mercury laser, kinetic processes in the partially ionized plasma following the excitation pulse of high-energy electrons should favor the production of atomic mercury ions and …
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High repetition rate fiber lasers
… work in high repetition rate femtosecond fiber lasers. Driven by the applications including optical arbitrary waveform generation, high speed optical sampling, frequency metrology, and timing and frequency distribution via fiber links, low noise fiber laser sources operating at multi-gigahertz …
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