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 16 of 16 for “"laser-induced damage"”.
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The Effect of Surface Processing Methods on the Laser Induced Damage Threshold of Fused Silica
High peak power laser systems, such as National Ignition Facility (NIF), Laser Mega Joule (LMJ), and High Power laser Energy Research facility (HiPER), include a large amount of optics. Fused silica glass is one of the most common optical materials which is used in these high peak power laser …
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Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas
… nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a …
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Pulsed laser induced breakdown in solid state materials and air
Laser induced breakdown is important in applications ranging from laser machining to laser induced breakdown spectroscopy to laser induced damage. Laser induced breakdown in dielectric materials results from a combination of multiphoton absorption (MPA), tunneling and avalanche ionization. Aspects …
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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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OPTICAL BISTABILITY IN ZINC-SULFIDE AND ZINC-SELENIDE THIN-FILM INTERFERENCE FILTERS AND IN GALLIUM-ARSENIDE AND COPPER-CHLORIDE ETALONS (NONLINEAR).
… drifting of the bistability loop in time and laser-induced "damage" indicate a thermal mechanism. The problem of water vapor absorption in such filters must be addressed before the inherent potential and advantages of these devices in two-dimensional image processing applications can be …
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Characterisation and implementation of synthetic diamond as a Raman laser material
… the material an attractive material for use in laser systems. Improvements in growth techniques over the past decade have led to a surge of research employing diamond in optical systems. This thesis presents the characterisation of diamond and its implementation in Raman lasers, utilising the …
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Design, synthesis, and characterization of complex chalcogenides for energy storage and energy conversion applications
… in LiMnPS4, promising harmonic signals with high laser-induced damage threshold in Na8Mn2(Ge2Se6)2.</p> <p>The second part of the research will discuss the synthesis and characterization of complex chalcogenides for thermoelectric applications. In this study, interplay between composition and …
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Optical resistance of dielectric coatings to multi-pulse femtosecond laser radiation /
… and theoretical analysis of the femtosecond laser pulse induced damage processes in thin film dielectric coatings. Experimental investigations were performed by automated metrological facility designed for S-on-1 laser-induced damage threshold measurements. Femtosecond repetitive pulses (1 …
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Ultrafast Machining of High Temperature Superconducting Nanostructures for Novel Mesoscale Physics
… mechanical scribing, and focussed ion beam, laser machining of YBCO has been continuously studied since 1988 due to its design flexibility and the absence of chemicals. One thing that is still not adequately understood is the nature of laser induced damage on YBCO, and to what proportion it …
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The effects of Nd:YAG laser cyclophotocoagulation on corneal sensitivity, intraocular pressure, aqueous tear production and corneal nerve morphology in the canine eye
… with prolonged healing following Nd:YAG laser cyclophotocoagulation in dogs is a frequent complication. It is hypothesized that these corneal ulcerations may be a form of neurotrophic keratitis due to laser-induced damage to corneal innervation. Fifteen clinically normal dogs had the …
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Nonlinear Microscopy for Material Characterization
Making use of femtosecond laser sources, nonlinear microscopy provides access to previously unstudied aspects of materials. By probing third order nonlinear optical signals determined by the nonlinear susceptibility chi(3), which is present in all materials, we gain insight not available by …
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Clinical and Experimental Approach to the Benefits and Risks of Laser Treatment for Diabetic Macular Edema
… with no diabetic retinopathy is 3 years. Laser treatment for diabetic macular edema has been used for decades, but studies have reported conflicting results regarding possible clinical complications following such therapy. Furthermore, the molecular events involved in the clinical benefits …
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Pulsed Laser Dielectric Ablation for Copper-plated Silicon Solar Cells
… solar cell manufacturing. However, concerns of laser-induced damage with carrier recombination and plated metal adhesion have contributed to a low market fraction of Cu-plated modules. This thesis aimed to further understand the contact formation process using light-induced plating (LIP) on …
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Computer-Generated Holography for Areal Additive Manufacture
… encountered. AM in metals is dominated by Laser Powder Based Fusion (L-PBF). Powder is spread in layers 10s of microns thick and selectively melted by scanning a small laser spot heat source over the bed. Traditional AM systems have limited ability to manage or compensate for heat …
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Didelės energijos keturių lėkių Nd:YAG stiprintuvas su SBS impulso spūda interferenciniam struktūravimui /
… high speed, precision and simplicity, lasers are often used in surface structuring. Direct Laser Interference Patterning (DLIP), is a laser-based technology that uses the physical principle of interference of high-intensity coherent laser beams, as well as laser ablation, to create …
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Femtosecond-laser irradiation as a platform for tailoring the optoelectronic properties of silicon
… to light in the infrared. Femtosecond (fs) laser irradiation offers multiple unique approaches to improving the optoelectronic properties of silicon, enabling both thin-film silicon photovoltaics and silicon-based IR photodetectors. In this thesis I study the structure-property-processing …