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 32 for “"Optical gain"”.
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Designing a Simulator for an Electrically-Pumped Organic Laser Diode
… by utilizing the organic material strictly for optical gain. The challenge occurs when charge carriers appear in the organic material. The charge carriers must reach a concentration such that population inversion occurs producing optical gain. However, between the overlapping emission and …
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Optical and Electrical Properties of Novel Quantum Dot Lasers and Amplifiers
… FP laser, a particular transverse-electric (TE) gain narrowing and transverse-magnetic (TM) gain pinning is measured below threshold. A polarization-dependent photon-mediated carrier redistribution with the coupled rate equation model is proposed to explain this unique optical gain evolution …
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Modeling and optimization of the transistor laser operation
… serve as electron traps to reduce the electrical gain and produce an optical gain. Based on the analysis on the charge control model, the optical gain can be modulated by the cladding structure of the base. Second, the radiative recombination is analyzed from the first principles. The results …
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Data-driven approach to understanding exciton-exciton interactions in CsPbBr₃ nanocrystals
… system for light-emitting applications. Optical gain in semiconductor nanocrystals relies on emission from biexciton or doubly excited states. Knowledge of the spectral properties of biexciton states is critical for understanding optical gain development as well as many-body interactions …
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Engineering the optical properties of subwavelength devices and materials
… demand materials with seemingly incompatible optical characteristics. For example, immersion photolithography is a resolution enhancing technique used to fabricate the ever-shrinking nanostructures in integrated circuits but requires a material that has-at the same time--a large index of …
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Characterisation of optical fibre amplifiers: amplifiers for the 632.8 nm He-Ne wavelength in praseodymium-doped ZBLAN
… in a praseodymium-doped fluorozirconate optical fibre at the 632.8 nm He-Ne wavelength, has been conducted. The optical gain is fundamentally related to the spectroscopic characteristics of praseodymium-doped in a fluorozirconate glass host together with optical fibre parameters, that …
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Operating Range of Aluminum - Gallium-Arsenide Quantum-Well Heterostructure Lasers: Tunability, Power Output, and High Energy Emission (Semiconductor, Optical, Diode)
… to provide broadband (7800-8300 (ANGSTROM)) optical gain.
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Characteristics, Theory and Modeling of the Transistor Laser
… spontaneous carrier lifetime, high differential optical gain, and unique three-terminal electrical-optical characteristics for direct “read-out” of its optical properties. These potentially lead to advantageous and useful features for designing high-speed optical transmitters that operate without …
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Organic lasers and nanostructred organic films for hybrid integration
… properties for colour conversion and as laser gain material are under investigation. To keep the LEPs' benefit of simple and low-cost fabrication, integration onto inorganic semiconductor devices such as in particular gallium nitride light emitting diodes (LEDs) is an important research topic. …
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Amplified Total Internal Reflection at the Surface of Gain Medium
… whether amplified TIR froma medium exhibiting optical gain is possible, and desire for a theory to explain it.Authors have suggested theories both in favor and in doubt of the phenomenon’s ex-istence, and experimental evidence has arose supporting the existence and seeminglysimultaneously …
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External cavity laser label-free biosensor
… laser, we demonstrate a new type of label-free optical biosensor that achieves a high quality factor through the process of stimulated emission, while at the same time providing high sensitivity, large dynamic range and simple detection instrumentation. The photonic crystal is fabricated …
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Low threshold organic and quantum dot nanobeam lasers
… We cover the theory behind generation of optical gain and lasing as well as the theory of photonic crystals. We outline a strategy for designing laser cavities using the chosen gain materials. Finally, we demonstrate a low lasing threshold of 4.2 [mu]J/cm2 for our organic lasers.
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n-type silicon-germanium based terahertz quantum cascade lasers
… the electron distribution, current density and gain in a range of device designs. The effect of nonabrupt interface geometries is investigated and the effect of intervalley mixing upon the emission spectrum is considered. It is shown that germanium/germanium–silicon heterostructures offer much …
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Analysis of Photonic Structures for Optical Networks
… de la Célula Lógica Programable Óptica (Optically Programmable Logic Cell, OPLC) basadas en Láseres de Pozo Cuántico, capaces de proporcionar diferentes funciones lógicas booleanas y se propone teóricamente un circuito de recuperación de la señal de reloj utilizando OPLCs. Finalmente, se …
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Design and development of distributed feedback transistor lasers
… spontaneous carrier lifetime, high differential optical gain, and electrical-optical characteristics for direct “read-out” of its optical properties. These devices have demonstrated many useful features such as high-speed optical transmission without the limitations of resonance, non-linear …
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Signal modulation and relative intensity noise properties of transistor laser and nano-cavity VCSEL
… recombination lifetime, high differential optical gain, and low carrier injection density. Due to these characteristics, we have demonstrated that the TL is able to achieve high speed resonance-free optical response as well as ultra-low laser relative intensity noise (RIN) reaching the …
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Semiconductor-based all-optical switching for optical time-division multiplexed networks
All-optical switching will likely be required for future optical networks operating at data rates which exceed electronic processing speeds. Switches utilizing nonlinearities in semiconductor optical amplifiers (SOA) are particularly attractive due to their compact size, low required switching …
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Ge-on-Si light-emitting materials and devices for silicon photonics
… is an ideal platform for the implementation of optical interconnection capable of high bandwidth and low power consumption by integrating electronic and photonic devices on silicon. Many optical components in silicon photonics have been extensively studied, among which a silicon-based laser is …
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Manipulating Bose-Einstein condensates with laser light
… An atomic wave packet was amplified with a gain of 10 to 100. Phase-coherence of the amplifier was verified by observing the interference of the output wave with a reference wave packet. Optical properties of the dressed condensate were also characterized, focusing on the key role of …
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Strain-induced self-rolled-up semiconductor micro/nanotubes: Fabrication and characterization
… it forms a heterostructure. As a result, optical gain media such as quantum wells and quantum dots can be embedded in the tube wall and these semiconductor tubes have potential for application as optoelectronic devices. In this dissertation, metal-organic chemical vapor deposition (MOCVD) …
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