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 49 for “"Laser technology"”.
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New extended methine dyes for application in laser technology
Based on the known reverse saturable absorption properties of certain coumarin and long chain polymethine dyes, the synthesis of new related structures was undertaken in order to examine the relationships between structure and RSA activity. It was hoped that in this way, more effective RSA …
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Low-cost, highly efficient, and tunable ultrafast laser technology based on directly diode-pumped Cr:Colquiriites
… highly-efficient, and tunable femtosecond laser technology based on diode-pumped Cr:Colquiriite gain media (Cr:LiCAF, Cr3+:LiSAF and Cr:LiSGaF). By using inexpensive single-mode diodes ($150) as the pump source, we have obtained continuous-wave (cw) output powers >250-mW with slope …
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The Application of Laser Technology for Railroad Top of Rail (TOR) Friction Modifier Detection and Measurements
… sensors and optical devices, such as independent lasers and detectors, are examined in a comprehensive parametric study to determine the most suitable configuration for a prototype with adequate third-body detection. A prototype is constructed considering parameters such as sunlight contamination, …
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The Impact of Process Replacement on Sheet Metal Product Design: The Use of Steel Extrusions Versus Formed Sheet Metal
… brake operations with advanced automated tube laser technology. The proposed shift not only simplifies the manufacturing process but also aligns with the broader goal of global cost reduction and process standardization, which are essential for enhancing New Product Introduction (NPI) …
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Gain-Guided Aluminum-Gallium - Arsenide - Gallium-Arsenide Quantum-Well Heterostructure Lasers Fabricated by Hydrogenation
Semiconductor lasers have become the most widely utilized form of coherent light emitters. Aluminum gallium arsenide is the prototype material system in heterostructure laser technology. New fabrication techniques that are simple and easily implemented with present technology may have an impact on …
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The development of high power, pulsed fiber laser systems and their applications
Due to the recent renewal in interest in fiber laser technology, continuous wave (c.w.) laser technology using rare-earth doped silica fibers has developed rapidly in the past few years. In the late 80s, Erbium Doped Fiber Amplifiers were commercialised and became widely used in the …
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Ultrafast Transient Absorption and Multi-Wave Mixing Spectroscopies in the Extreme Ultraviolet and Soft X-RAY Regimes
… temporal resolution. Advancements in ultrafast laser technology enable researchers to observe and manipulate electronic states within their natural attosecond, femtosecond, and picosecond timescales, thus providing a deeper understanding of the electronic processes that underpin structural …
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Laser treatment of Asphaltene based Carbon Fibers
… and 3000 °C. In this study, the potential use of laser technology as an alternative heat treatment source is proposed due to its rapid and high energy generation capabilities. Laser treatment generates energy measured above 2000 °C using a pyrometer, by adjusting scan speed, laser power, and …
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PULSED LASER PROCESSING FOR HIGH EFFICIENCY SILICON WAFER SOLAR CELLS
Laser technology has become one of the commonly applied techniques for high-efficiency silicon wafer solar cell fabrication. In order to incorporate laser processing technology in high efficiency solar cell fabrication, laser induced material damage has to be minimized or even eliminated. This …
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Optimization of sub-10 femtosecond titanium sapphire lasers
Kerr-lens mode locked Ti:sapphire lasers are the backbone of most ultrafast and attosecond pulse generation systems. As such when building such systems the experimentalist desires an easy to use and robust system to produce femtosecond pulses for use in experiments. Towards this end I will discuss …
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From Hand Craft to Digital Technology: a practice-based material culture analysis of the historical and contemporary ancillary trades of the London élite fashion industry
… by examining and assessing the potential of laser technology to those trades that are concerned with embellishment; and by developing and applying a material culture framework to the execution and analysis of practice. The ancillary trades serve the material production of luxury fashion …
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A Narrow-Linewidth Laser at 1550 nm Using the Pound-Drever-Hall Stabilization Technique
… and it is a defining characteristic of coherent lasers. Narrow linewidth laser technology, particularly in the field of fiber-based infrared lasers, has progressed to the point where highly stable sources are commercially available with linewidths on the order of 1-100 kHz. In order to achieve a …
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Applications of Fourier Domain Mode Locked lasers for optical coherence tomography imaging
… spectra are generated with a wavelength-swept laser and photodetector. Axial image lines are obtained via Fourier transformation of the spectra. Fourier domain techniques have extended OCT imaging speeds from several thousand to hundreds of thousands of axial lines per second, enabling in vivo …
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Up-conversion In Rare-earth Doped Micro-particles Applied To New Emissive 2d Dislays
… rare-earth co-doped fluorides to convert diode laser light in the near infrared to red, green and blue visible light is applied to make possible high performance emissive displays. The infrared-to-visible UC in the materials we study is a sequential form of non-linear two photon absorption in …
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All-solid-state femtosecond medical lasers and nonlinear laser-tissue interactions
Diode pumped all-solid-state ultrafast lasers are promising for mini-invasive refractive surgery and keratoplasty. A funda mental systematical study concerning ultrafast laser tissue interactions is crucial before applying the state of the art laser technology to ophthalmic applications. Porcine …
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Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
Pulsed fiber laser has tremendous application in laser processing and laser sensor. The key element to produce a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate …
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HIGH POWER PULSED FIBER LASER SOURCES AND THEIR USE IN TERAHERTZ GENERATION
… the development of high power pulsed fiber laser systems. These systems utilize phosphate glass fiber for active elements, instead of the industry-standard silica fiber. Because the phosphate glass allows for much higher doping of rare-earth ions than silica fibers, much shorter phosphate …
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Discrete-frequency infrared imaging with a quantum cascade laser and diffuse optical Raman tomography: methods toward improving clinically relevant label-free chemical contrast
… potential include the use of quantum cascade laser technology for mid-infrared spectral imaging and diffuse Raman tomography for three dimensional chemical analysis. In this thesis, we constructed and evaluated two analytical instruments which represent the first steps toward realizing these …
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