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Showing 1 to 20 of 24 for “"MOPA"”.
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Hollow optical fibers and W-type fibers for high power sources and suppression of the stimulated Raman scattering
… fiber-based master oscillator power amplifier (MOPA) source, using W-type Yb The suppression of the stimulated Raman scattering (SRS) in a small and single-mode core becomes an issue when considering the power scaling of a fiber laser. Here a W-type fiber was designed for SRS suppression with …
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Development of Novel Compact Laser Sources for Bio-Medical Applications
… master oscillator power amplifier (MOPA) picosecond optical pulse sources using all chirped QD structures were investigated using the MOPA system consisting of two parts, firstly QD-ECMLL and secondly a tilted taper QD-SOA. A further investigation involved a comparison between …
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Neue Prinzipien zur Realisierung von gepulsten, frequenzstabilisierten Lasern mit hoher mittlerer Leistung und exzellenter Strahlqualität
… Um diese Ziele zu erreichen, wurde ein MOPA-System (Master Oscillator Power Amplifier) mit Frequenzstabilisierung auf der Basis von doppelbrechungskompensierten, transversal diodengepumpten Laserstäben entwickelt und untersucht. Auf dem Weg dahin wurden unterschiedliche …
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Entwicklung, Modellierung und Aufbau des 10 Joule-Vorverstärkers mit adaptiver Optik für den Petawatt-Laser PHELIX
… im Bereich von 10-100 eV. Der Laser ist als MOPA-System entworfen und erzeugt 1-20 ns lange Pulse mit Energien bis zu 5 kJ oder 500 fs lange Pulse mit Intensitäten bis zu 10^{21}W/cm². Diese Arbeit beschäftigt sich zum einen mit der Entwicklung, der Modellierung und dem Aufbau des 10 Joule, …
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High-power deep-UV laser for improved and novel experiments on hydrogen
… stabilized master oscillator power amplifier (MOPA) that can be referenced to a coherent frequency comb. This MOPA can be amplified to > 10 W of narrow linewidth power at 972.5 nm in the Yb-fiber amplifier. This is a technically challenging and notable result for this wavelength as gain is much …
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High-power cladding-pumped Raman and erbium-ytterbium doped fibre sources
… a master-oscillator power-amplifier (MOPA) based on large core Er:Yb doped fibres is developed for the generation of high-energy pulses. The details of the MOPA are studied and presented. With careful design considerations, pulses free from non-linear effects, with energy up to 1 mJ …
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Stereo-directing effect of molecularly imprinted polymers on cinnamic acids
… and ethyl (E)-3-(4-methoxyphenyl) acrylate (Et-MOPA) demonstrated a significant cross-reactivity with ferulic acid (k` = 0.356), moderate cross-reactivity with t-4HCA (k` = 2.340) and minimal cross-reactivity with Et-MOPA (k` = 1.635). Optimum photoisomerization of t-4MCA at 3 h resulted in the …
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Powers scaling and nonlinear frequency conversion of single-frequency lasers based
… of the master-oscillator-power-amplifier (MOPA), it was used to pump a series of cw singly-resonant optical parametric oscillators (SROs) based on periodically-poled lithium niobate. Although SROs are inherently single-frequency they suffer detrimentally from mode-hopping, therefore in the …
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Laser micro-processing of silicon using nanosecond pulse shaped fibre laser at 1 μm wavelength
… lasers with Master Oscillator Power Amplifier (MOPA) architectures that offer high repetition rates, high operational efficiencies, and pulse modulation controls exceeding those of typical Q-switched DPSS lasers. The aim of this research is to investigate 1 μm fibre laser machining of Si with a …
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High power pulsed ytterbium doped fibre lasers and their applications
… doped fibre master oscillator power amplifier (MOPA) systems seeded by semiconductor lasers. I was principally focused on two specific projects aligned to sponsored programs of research within the ORC pulsed fibre laser group: the first project, TSB funded project LAMPS, aimed to develop an …
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Partisanship and Opportunities for Additional Bipartisanship in Tech Immigration and Privacy Reform
This paper explores the history of technology and government by analyzing the longstanding partisan advantage Democrats have had in the Silicon Valley and other tech hubs. Additionally, this paper seeks out opportunities for bipartisanship, specifically in the legislative realms of tech privacy and …
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San Francisco's Response to Sexual Assault: Pathways to Creating a Survivor-Centered Criminal Justice System
<p>This research examines the process when adult sexual assault survivors in San Francisco decide to pursue legal justice and how survivors experience the local criminal justice system. My analysis exposes the mistreatment of survivors who participate with local law enforcement and recommends …
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Veto Syria: Explaining the Power of the United Nations Security Council and the Syrian Refugee Crisis
<p>The purpose of this research is to provide an analysis of the United Nations Security Council compliance with the Charter of the United Nations and the effectiveness of its Responsibility to Protect innocent civilians from crimes committed against them, particularly within the Syrian region in …
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Are We Out of the Woods Yet? How Democrats and Progressives Need to Rethink their Message Framework
<p>The aftermath of the election revealed that the Democratic Party made critical errors and had structural issues that made executing our messaging more difficult. The Democratic Party needs to return to a set of principles that prioritizes all people and their wellbeing to win elections. What do …
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Lessons Learned: Can a Principled Mechanism for Improving Health Equity be Integrated into a Budgetary Process?
<p>Health equity is the social justice lens that public health institutions across the United States have increasingly embraced as a mandate, however there are few jurisdictions addressing how to prioritize funding toward that end. The practical translation of a social justice concept necessitates …
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Are Condo Owners Changing San Francisco's Voting Habits?
<p> As San Francisco grows and continues to draw more people to its shores, the question of how these changes will impact the city’s political identity is one that desires a lot of time, research, and attention. This paper seeks to provide some light on one of these questions; how are condo owners …
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How Effective Is the San Francisco Unified School District in Educating Homeless Youth?
<p><strong>Executive Summary:</strong></p> <p>The McKinney-Vento Homeless Assistance Act was passed in 1987 as the first landmark legislation to combat the national homelessness epidemic. Since its inception, the McKinney- Vento Act has been amended six different times. The McKinney-Vento Act has …
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Social Marketing and California High-Speed Rail: A Framework for Behavioral Change Towards Sustainability
<p>In this analytical paper, I advocate for the use of social marketing techniques in a campaign targeted towards Central Valley communities with the primary objective of reducing this population’s opposition to the state’s High-Speed Rail project. A secondary objective is to use this strategy to …
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A Mandatory Spay/Neuter Ordinance in San Francisco: The Solution to San Francisco’s Other Homeless Problem
<p>This Capstone explains the dog overpopulation problem in San Francisco where the increase in dog impoundments and animal cruelty cases, particularly ones involving dogs, has been straining its Department of Animal Care & Control’s already limited resources. At least 33 local governments around …
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How Do You Mobilize Public Support for Infrastructural Investment in California’s Aging Water System?
<p>This paper looks at how the state of California maintains an aging water system – the California State Water Project (SWP) – that will threaten California’s water supply if further maintained, and concludes that the system faces three major problems that are of concern in 2017 – aging pipes, …
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