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 226 for “"light sources"”.
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The assessment of light sources
Discomfort glare from normal sources has been thoroughly researched over the last five decades and agreement has been reached by the CIE to express it by the Unified Glare Rating (UGR) formula: UGR = 8 log₁₀g where: g = (0.785/Eᵢ)Σ(L²ω/p²) (see Glossary) Hardly any research, however, has been done …
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Designing subwavelength-structured light sources
… and phenomena involved in the interaction of light with a variety of material systems, which will in turn guide the designs of compact lasers with feedback structures having features at the subwavelength-scale. The thesis begins by describing the interaction of light with an arbitrary complex …
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Novel semiconductor based broadly tunable light sources
The development of compact and low-cost coherent sources in visible and infrared wavelength range can provide indispensible tools for a variety of scientific, technological and industrial applications. Great progress over the last years in material science, crystal growth and semiconductor material …
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Nanostructures for Coherent Light Sources and Photodetectors
… integration is limited by the lack of efficient light sources and broadband photodetectors, which could be integrated with the silicon complementary metal-oxide-semiconductor (CMOS) technology. Persistent efforts continue to achieve efficient light emission as well as broadband photodetection …
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Plasmonics for On-Chip Photodetectors and Light Sources
… their maximum repetition rates as single photon sources, as well as decreasing saturation power leading to less pump induced noise. Further, the significant reduction in fluorescence lifetimes observed for quantum emitters coupled to nanophotonic cavities enhances their viability for use in …
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Multidimensional fiber quantum light sources and their applications
… of multidimensional optical fiber-based quantum light sources. We study spontaneous four-wave mixing processes in optical fibers that can create photon pairs correlated in spatio-spectral degrees of freedom. Utilizing spatial light modulators, we show control over individual spontaneous four-wave …
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Impact of Artificial UV Light Sources on the Skin
… In 2010 Westminster wanted information on sources of artificial UV radiation in particular sunbeds. The objective of this study was to measure the spectral outputs from artifcial tanning units throughout England and to compare the outputs to European and British compliance levels. The …
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Sub-femtosecond optical timing distribution for next-generation light sources
… is critical for realizing a new regime of light control in next-generation X-ray free-electron lasers. These facilities aim to generate sub-femtosecond (fs) X-ray pulses with unprecedented brightness to realize the long-standing scientific dream to capture chemical and physical reactions …
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Free-electron-driven nanoscale light sources: from Hertzian antennas to metamaterials
… development of new types of nanoscale optical light sources driven by free-electrons and on the investigation of the underpinning physical phenomena. It is focused on three types of nanoscale light sources with increasing degree of complexity: a nanoscale antenna, an undulator-based tuneable …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… initial LIGO and GEO600 detectors. A squeezed light source for aLIGO must meet stringent requirements in terms of optical loss, phase noise, and scattered light. The squeezer must produce high levels of audio-band squeezing and operate under vacuum, to take advantage of the excellent existing …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… initial LIGO and GEO600 detectors. A squeezed light source for aLIGO must meet stringent requirements in terms of optical loss, phase noise, and scattered light. The squeezer must produce high levels of audio-band squeezing and operate under vacuum, to take advantage of the excellent existing …
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Towards broadly-tunable CMOS-compatible silicon light sources in the near-infrared
The efficient extraction of light from silicon is one of the longstanding challenges of modem engineering and physics. The difficulty mainly arises from silicon's indirect bandgap and the short lifetime of non-radiative processes such as Auger recombination. Nonetheless, the realization of an …
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Novel broadband light sources and pulse generation techniques at 1.5 [mu]m
… has come to rely on broadband optical light sources as key enabling tools. In this thesis, we investigate three devices that contribute to the generation of broadband light at 1.5 [mu]m. The first two fall into the same broader class of saturable absorber mirrors - one device was …
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Improving visibility of latent stains on dark fabric: dark adaptation and stroboscopic light sources
… in analysis is to examine the item under white light. The next step in examination often involves the use of alternate light sources (ALS) to search for potential biological evidence. Dark adaptation has been suggested as a method to maximize benefits from fluorescent evidence examinations. Dark …
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Light source as a factor in growth and reproduction and the influence of the opposite sex on reproduction in turkeys
This study evaluated the effects of three light sources (sodium vapor, daylight fluorescent, and incandescent) on growth and reproduction in turkeys, and the influence of the opposite sex on reproduction when using these three light sources. The influence of the various treatments as potential …
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Colloidal quantum dot based light emitting devices on silicon substrate
Light sources based on silicon have been the subject of interest for many years. Silicon would not only provide high volume manufacturing for commercialization but also allow complementary metal oxide semiconductor (CMOS) compatibility enabling integration of light sources within CMOS circuitry. …
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Impurity-induced layer disordering and hydrogenation in the indium aluminum gallium phosphide material system: Visible spectrum semiconductor lasers
… of semiconductor lasers, coherent visible light sources can be made with extremely low power requirements. Applications for such sources include high-density optical storage units and optical communications. Additionally, the use of multiple-stripe arrays makes high-power ($\gg$200 mW per …
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