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[{"key": "dc.contributor.advisor", "value": "Reponen, Mikael", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Nicolas Richterich", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2025-04-14T08:44:54Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2025-04-14T08:44:54Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2025", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/101409", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4ss\u00e4 tutkielmassa kehitet\u00e4\u00e4n synkronoituja laserkaviteettielementtej\u00e4 kahteen laserkaviteettiin FURIOS-laserionil\u00e4hteess\u00e4 Jyv\u00e4skyl\u00e4n yliopiston IGISOL-laboratoriossa. Tavoitteena oli toteuttaa hilakaviteetissa jatkuva taajuuden kaksinkertaistaminen s\u00e4\u00e4t\u00e4m\u00e4ll\u00e4 BiBO-kiteen kallistuskulmaa skannatessa aallonpituuksia hilalla, kun taas kaksoisetalonkaviteetissa tavoitteena oli korvata kiinte\u00e4 etalon matalah\u00e4vi\u00f6isell\u00e4 ilmaraollisella etalonilla ja taajuusvakauttaa se.\nKaviteettien aktuaattorit konfiguroitiin EPICS-moottoreiksi niiden ohjaamista varten ja olemassa olevaa skannausohjelmistoa kehitettiin lis\u00e4\u00e4m\u00e4ll\u00e4 skanniohjelmia, mink\u00e4 j\u00e4lkeen olennaiset kaviteettielementit karakterisoitiin. Taajuuden kaksinkertaistamista kiteen kallistuskulmaa s\u00e4\u00e4t\u00e4m\u00e4ll\u00e4 l\u00e4hestyttiin sek\u00e4 vaihesovittamisen ett\u00e4 teho-optimoinnin n\u00e4k\u00f6kulmista, kun taas ilmaraollisen etalonin vakauttamiseksi ohjelmaan implementoitiin PID-s\u00e4\u00e4din.\nJatkuvaa taajuustuplaamista kallistuskulmaa s\u00e4\u00e4t\u00e4m\u00e4ll\u00e4 aallonpituusskannauksen aikana ei saavutettu johtuen hilaskannauksen aikana tapahtuvasta atsimuuttikulman vaihtelusta ja BiBO:n vaihesovituksen kulmahyv\u00e4ksynn\u00e4n pienuudesta. Kaksinkertaistetun taajuuden maksimi voidaan kuitenkin l\u00f6yt\u00e4\u00e4 teho-optimointiskannilla m\u00e4\u00e4ritellyll\u00e4 skannausalueella. PID-s\u00e4\u00e4din vakautti ilmaraollisen etalonin taajuuden onnistuneesti poistamalla moodihypyt ja pitk\u00e4n aikav\u00e4lin taajuusvaihtelun, mutta s\u00e4\u00e4din my\u00f6s aiheuttaa pient\u00e4 lyhyen aikav\u00e4lin vaihtelua.\nJatkuvan taajuuskaksinkertaistetun aallonpituusskannauksen kehitt\u00e4mist\u00e4 tulisi jatkaa joko BiBO:n l\u00e4mp\u00f6tilaviritt\u00e4misell\u00e4 tai k\u00e4ytt\u00e4m\u00e4ll\u00e4 vain yhden optisen akselin omaavaa kidett\u00e4 kulmavirityksess\u00e4. Ilmaraollisen etalonin jatkokehityksess\u00e4 tulisi puolestaan keskitty\u00e4 mekaanisesti vakaamman peilikotelon rakentamiseen korkeampiheijasteisien peilien avulla.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The aim of this thesis is to develop synchronized laser cavity elements in two laser cavities at the FURIOS laser ion source in the IGISOL facility of the University of Jyv\u00e4skyl\u00e4. The task in a grating cavity was to implement continuous intracavity second harmonic generation during wavelength scanning through angle tuning of a BiBO crystal, while in a dual etalon the task was to replace a solid etalon with a low-loss air-spaced etalon and frequency stabilize it.\nThe actuators in the cavities were configured as EPICS Motors for control and existing scanning software was developed with scanning loops, after which the relevant cavity elements were characterized with various scans. The second harmonic generation angle tuning was approached through phase matching and as a power optimization task, while a PID controller was implemented to stabilize the air-spaced etalon.\nContinuous SHG angle tuning during wavelength scanning was not achieved due to variation in the azimuthal angle during grating scanning and the small angular acceptance in BiBO phase matching, but a power optimization scan loop was successfully implemented for a given scan range. The PID controller frequency stabilized the air-spaced etalon successfully by removing mode jumping and long term frequency drift, but introduced small short term oscillations.\nFurther development of the continuous SHG wavelength scanning should be done with either BiBO temperature tuning or by using an uniaxial crystal in angle tuning, while further development of the air-spaced etalon should happen with a more mechanically robust mirror casing and higher reflectivity mirrors.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2025-04-14T08:44:54Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2025-04-14T08:44:54Z (GMT). No. of bitstreams: 0\n Previous issue date: 2025", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "78", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "Ti:Sa", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "Nd:YAG", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "air-spaced etalon", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "diffraction grating", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "BiBO", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "SHG", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Development of synchronized laser cavity elements", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202504143236", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": null, "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": null, "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.copyright", "value": "\u00a9 The Author(s)", "language": "fi", "element": "rights", "qualifier": "copyright", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.yso", "value": "laserit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "isotoopit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "lasertekniikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "spektroskopia", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.description.accessibilityfeature", "value": "unknown accessibility", "language": "en", "element": "description", "qualifier": "accessibilityfeature", "schema": "dc"}, {"key": "dc.description.accessibilityfeature", "value": "ei tietoa saavutettavuudesta", "language": "fi", "element": "description", "qualifier": "accessibilityfeature", "schema": "dc"}]
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