<div class="csl-bib-body">
<div class="csl-entry">Würkner, N. (2022). <i>Spectral shaping and bifurcation suppression for pulsed laser amplifiers</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2022.91745</div>
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dc.identifier.uri
https://doi.org/10.34726/hss.2022.91745
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/80487
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dc.description.abstract
Lasers are a flexible and powerful tool in many modern technological and scientific applications. A special type of lasers used in these applications are high-energy pulsed lasers, which need special optical amplifiers to achieve the required energy levels. Among these amplifiers are regenerative amplifiers (RA), which use multiple passes through a gain medium to amplify incoming seed pulses. RAs can show bifurcation due to the coupling of subsequent pulses introduced by the dynamics of the stored energy of the amplifier, which is undesirable for most applications. A control oriented reduced-order mathematical model of such an amplifier is investigated in this thesis in order to suppress these bifurcations using model-based control methods. This model uses small gain estimations of the individual passes through the gain medium combined with slowly varying envelope estimates and spatial averaging to achieve a simplified state-space model of the observed dynamics. Based on this description, a linear quadratic regulator (LQR) combined with an extended Kalmanfilter (EKF) is designed. The suppression of bifurcations due to feedback stabilization achieved by the LQR then enables the use of output pulse shaping techniques using iterative learning control (ILC) at arbitrary operating points. The designed system is shown to achieve pulse shaping for different operating points while staying within the input constraints introduced by the optical filter.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
spectral pulse shaping
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dc.subject
feedback control
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dc.subject
adaptive control
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dc.subject
laser amplifiers
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dc.subject
ultra-short laser pulses
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dc.title
Spectral shaping and bifurcation suppression for pulsed laser amplifiers
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dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.identifier.doi
10.34726/hss.2022.91745
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dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Nikolaus Würkner
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dc.publisher.place
Wien
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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dc.contributor.assistant
Deutschmann-Olek, Andreas
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tuw.publication.orgunit
E376 - Institut für Automatisierungs- und Regelungstechnik