000349004 001__ 349004
000349004 005__ 20240606091902.0
000349004 0247_ $$2URN$$a	urn:nbn:de:gbv:18-ediss-118097
000349004 037__ $$aGSI-2024-00465
000349004 041__ $$aEnglish
000349004 1001_ $$0P:(DE-Ds200)OR9307$$aSalman, Haydar Sarper$$b0$$eCorresponding author
000349004 245__ $$aHigh-power frequency combs for precision spectroscopy in the extreme ultraviolet
000349004 260__ $$aHamburg$$bSUB Hamburg$$c2023
000349004 300__ $$a101 p.
000349004 3367_ $$2DataCite$$aOutput Types/Dissertation
000349004 3367_ $$2ORCID$$aDISSERTATION
000349004 3367_ $$2BibTeX$$aPHDTHESIS
000349004 3367_ $$02$$2EndNote$$aThesis
000349004 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1717658216_1886667
000349004 3367_ $$2DRIVER$$adoctoralThesis
000349004 502__ $$aDissertation, Universität Hamburg, 2023$$bDissertation$$cUniversität Hamburg$$d2023$$o2023-11-01
000349004 520__ $$aUltra-high-resolution spectroscopy provides the basis behind multiple scientific fields and in particular, for frequency metrology. The required techniques usually involve optical frequency combs, which are well established in the visible and infrared spectral regions. In contrast, the Vacuum- and Extreme Ultraviolet (VUV and XUV) are barely explored spectral ranges, mainly due to the lack of a suitable light source. However, many atoms and in particular ions of fundamental interest await to be analyzed. Additionally, prospective nuclear clocks based on optically driving the low energy 229Th nuclear transition (about 8.3 eV), set high demands on dedicated VUV sources. A possible solution can be provided by high-power frequency combs combined with cavity-enhanced high-harmonic generation (HHG). However, this combination represents a highly complex approach with great challenges if long-term stable, low-noise operation is required. This is particularly important should ultra-narrow transitions such as the 229Th transition be targeted. This dissertation addresses these challenges, describing the complete development of a fully-stabilized high-power femtosecond frequency comb centered at 1 μm wavelength with 65MHz comb line spacing and more than 70W output power. Furthermore, important features including a new oscillator design, wavelength tuning, adaptation for remote computer control and a technical interlock, which ensures fail-safe and stable long-term operation of the system, are implemented. The dissertation shows for the first time that a fully-stabilized high-power frequency comb can be operated continuously over multiple days without interruption, setting the stage for VUV conversion and ultra-high-resolution spectroscopy in this spectral region.
000349004 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0
000349004 693__ $$0EXP:(DE-Ds200)External_experiment-20200803$$1EXP:(DE-Ds200)other-20200803$$5EXP:(DE-Ds200)External_experiment-20200803$$aother$$eExternal experiment at external facility/ no experiment at GSI (other)$$x0
000349004 909CO $$ooai:repository.gsi.de:349004$$pVDB
000349004 9101_ $$0I:(DE-Ds200)Ext-HIJ$$6P:(DE-Ds200)OR9307$$aExternal Helmholtz Institute: HIJ$$b0$$kHIJ
000349004 9131_ $$0G:(DE-HGF)POF4-621$$1G:(DE-HGF)POF4-620$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMaterie und Technologie$$vAccelerator Research and Development$$x0
000349004 9141_ $$y2023
000349004 920__ $$lyes
000349004 9201_ $$0I:(DE-Ds200)JHL-20220701OR461$$kJHL$$lHIJ / HL$$x0
000349004 980__ $$aphd
000349004 980__ $$aVDB
000349004 980__ $$aI:(DE-Ds200)JHL-20220701OR461
000349004 980__ $$aUNRESTRICTED