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A Thomistic Critique of the Ethics of Alasdair MacIntyre
Title
A Thomistic Critique of the Ethics of Alasdair MacIntyre.
Creator
Otte, Marcus, Jones, Donald, Marien, Daniel, Strawser, Michael, University of Central Florida
Abstract / Description
Alasdair MacIntyre argues in favor of a historicist Thomism in ethics and political philosophy. In his theory, sociological categories take up much of the space traditionally occupied by metaphysics. This peculiar feature of MacIntyre's Thomism, and its merits and demerits, is already a subject that has been taken up by many critics. In this thesis, these criticisms are supplemented and unified by identifying what is perhaps the most fundamental difficulty with MacIntyre's ethics: his version...
Show moreAlasdair MacIntyre argues in favor of a historicist Thomism in ethics and political philosophy. In his theory, sociological categories take up much of the space traditionally occupied by metaphysics. This peculiar feature of MacIntyre's Thomism, and its merits and demerits, is already a subject that has been taken up by many critics. In this thesis, these criticisms are supplemented and unified by identifying what is perhaps the most fundamental difficulty with MacIntyre's ethics: his version of Thomism is problematic because it treats epistemology as first philosophy. This misstep compromises MacIntyre's ability to provide a defense of moral objectivity, while also undermining his theory's usefulness in deriving moral rules. The result is an ethics of doubtful coherence. If Thomism is to offer a viable alternative to Enlightenment morality and Nietzschean genealogy, it must defend the priority of metaphysics with respect to epistemology.
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Date Issued
2014
Identifier
CFE0005537, ucf:50322
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0005537
Holographic Recording and Applications of Multiplexed Volume Bragg Gratings in Photo-thermo-refractive Glass
Title
Holographic Recording and Applications of Multiplexed Volume Bragg Gratings in Photo-thermo-refractive Glass.
Creator
Ott, Daniel, Glebov, Leonid, Zeldovich, Boris, Moharam, Jim, Rahman, Talat, University of Central Florida
Abstract / Description
Recent developments in holographic recording of volume Bragg gratings (VBGs) in photo-thermo-refractive (PTR) glass have demonstrated their utility as components in high power laser systems for spectral narrowing, transverse mode control, beam combining, and pulse stretching/compression. VBG structures are capable of diffracting incident light into a single diffraction order with high efficiency given the Bragg condition is met. The Bragg condition depends on both the wavelength and angle of...
Show moreRecent developments in holographic recording of volume Bragg gratings (VBGs) in photo-thermo-refractive (PTR) glass have demonstrated their utility as components in high power laser systems for spectral narrowing, transverse mode control, beam combining, and pulse stretching/compression. VBG structures are capable of diffracting incident light into a single diffraction order with high efficiency given the Bragg condition is met. The Bragg condition depends on both the wavelength and angle of the incident light making VBGs useful for filtering and manipulating both the wavelength and angular spectrum of a source. This dissertation expands upon previous research in PTR VBGs by investigating multiplexed VBGs and their applications in laser systems. Multiplexing involves the integration of several VBGs into the same volume of PTR glass. This process enables the fabrication of splitting and combining elements which have been used for high power beam combining with significantly reduced complexity as compared to other combining schemes. Several configurations of multiplexed beam combiners were demonstrated for both spectral and coherent combining systems with high power results yielding a combined power of 420 W with 96% efficiency. Multiplexing was also used to produce unique phase structures within VBGs. This effect was exploited to create extremely narrowband spectral filters called moir(&)#233; Bragg gratings. The technical challenges of producing moir(&)#233; gratings in bulk glass have revealed new insights into the use of PTR glass as a recording medium and produced devices capable of narrowband filtering of only 15 pm in the near infrared. Experiments were performed using such devices as intra-cavity laser elements for longitudinal mode selection. Investigations have also been made into increasing the level of multiplexing possible within PTR glass. These explorations included scaling the number of beam combining channels, fabrication of integrated multi-notch filters, and generated several other potentially interesting devices for future research. The summation of this work indicates a promising future for multiplexed VBGs in PTR glass.
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Date Issued
2014
Identifier
CFE0005392, ucf:50446
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0005392