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Rare-earth-doped single-crystal YAG fibers grown by the laser heated pedestal growth technique

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Title
Rare-earth-doped single-crystal YAG fibers grown by the laser heated pedestal growth technique
Name (type = personal)
NamePart (type = family)
Nie
NamePart (type = given)
Craig Daniel
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Craig Daniel Nie
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RoleTerm (authority = RULIB)
author
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NamePart (type = family)
Harrington
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James A
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James A Harrington
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Advisory Committee
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chair
Name (type = personal)
NamePart (type = family)
O'Carroll
NamePart (type = given)
Deirdre M
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Deirdre M O'Carroll
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Advisory Committee
Role
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internal member
Name (type = personal)
NamePart (type = family)
Mann
NamePart (type = given)
Adrian B
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Adrian B Mann
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Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Emge
NamePart (type = given)
Thomas J
DisplayForm
Thomas J Emge
Affiliation
Advisory Committee
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outside member
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Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
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Graduate School - New Brunswick
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school
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theses
OriginInfo
DateCreated (qualifier = exact)
2017
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2017-01
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2017
Place
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xx
Language
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eng
Abstract (type = abstract)
The laser-heated pedestal growth (LHPG) technique is an unconventional method for growth of single-crystal (SC) fibers with the advantages of high pulling rates and crucible-free processing when compared to more conventional techniques such as the Czochralski technique. In this dissertation, the processing of rare-earth (RE3+) doped yttrium aluminum garnet, Y3Al5O12, (YAG) fibers using the LHPG technique was significantly improved upon as the result of the development of a new, more accurate method to align the CO2 laser along with the minimization of waveguide irregularities. Initially, the dominant loss mechanism in the fabricated SC fibers was bulk scattering, resulting from thermal stresses in the core due to inadequate alignment. Once these stresses were remedied by the implementation of new alignment techniques, absorption became the dominant loss mechanism with minimal scattering. For short fiber lengths, the absence of diameter control did not prove to be critical. However, when fibers exceeded 30 cm in length, the waveguide would couple low-order modes to high-order modes that can become radiation modes at longer lengths. By implementing a diameter control feedback loop, these effects were minimized. The fibers were characterized by studying the optical properties of an undoped and doped air-clad SC YAG fiber (typically 330 μm in diameter). The total attenuation and scattering loss was measured using visible and NIR lasers. The lowest losses were achieved with the growth of a 1 m long SC fiber - lower than any currently published. The total attenuation of the YAG fibers is now below 0.3 dB/m, at 1064 nm. This loss is primarily attributed to the bulk absorption of the raw material, with as little as 0.02 dB/m of this loss coming from scattering in RE doped YAG fibers. At non-absorbing wavelengths, the 0.5% Ho:YAG fibers have an equivalently low loss. This low loss is critical for applications of YAG fibers, specifically regarding lasing of 0.5% Ho:YAG. Lasing has been demonstrated with increasing slope efficiency as the quality of the crystal fiber was improved. At 72.3%, the fiber’s slope efficiency with respect to incident pump power is approaching the slope efficiency for bulk Ho:YAG lasers.
Subject (authority = RUETD)
Topic
Materials Science and Engineering
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Title
Rutgers University Electronic Theses and Dissertations
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ETD
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ETD_7858
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (xvi, 145 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Craig Daniel Nie
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T32B91G8
Genre (authority = ExL-Esploro)
ETD doctoral
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The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Nie
GivenName
Craig
MiddleName
Daniel
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2017-01-12 13:05:30
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Name
Craig Nie
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Affiliation
Rutgers University. Graduate School - New Brunswick
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Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2017-01-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2017-08-02
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after August 2nd, 2017.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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