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Université de Neuchâtel

Semiconductor disk laser-based frequency combs

Jornod, Nayara ; Südmeyer, Thomas (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Cette thèse présente une étude des premiers peignes de fréquences auto-référencés basés sur des lasers à disques semi-conducteurs (SDLs) à modes verrouillés en phase. L’avènement des peignes de fréquences stabilisés basés sur des lasers à impulsions ultra-courtes a permis une avancée significative et de nombreuses applications dans divers domaines de la physique, de la...

Université de Neuchâtel

Carrier-envelope offset frequency stabilization of a thin-disk laser oscillator operating in the strongly self-phase modulation broadened regime

Modsching, Norbert ; Paradis, Clément ; Brochard, Pierre ; Jornod, Nayara ; Gürel, Kutan ; Kränkel, Christian ; Schilt, Stéphane ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Express, 2018, vol. 26, no. 22, p. 28461-28468

We demonstrate the carrier-envelope offset (CEO) frequency stabilization of a Kerr lens mode-locked Yb:Lu2O3 thin-disk laser oscillator operating in the strongly self-phase modulation (SPM) broadened regime. This novel approach allows overcoming the intrinsic gain bandwidth limit and is suited to support frequency combs from sub-100-fs pulse trains with very high output...

Université de Neuchâtel

Broadband terahertz pulse generation driven by an ultrafast thin-disk laser oscillator

Clément, Paradis ; Drs, Jakub ; Modsching, Norbert ; Razskazovskaya, Olga ; Meyer, Frank ; Kränkel, Christian ; Saraceno, Clara J ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Express, 2018, vol. 26, no. 20, p. 26377-26384

We demonstrate broadband THz generation driven by an ultrafast thin-disk laser (TDL) oscillator. By optical rectification of 50-fs pulses at 61 MHz repetition rate in a collinear geometry in crystalline GaP, THz radiation with a central frequency at around 3.4 THz and a spectrum extending from below 1 THz to nearly 7 THz are generated. We realized a spectroscopic characterization of a GaP crystal...

Université de Neuchâtel

Kerr lens mode-locked Yb:CALGO thin-disk laser

Modsching, Norbert ; Paradis, Clément ; Labaye, François ; Gaponenko, Maxim ; Graumann, Ivan J ; Diebold, Andreas ; Emaury, Florian ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Letters, 2018, vol. 43, no. 4, p. 879-882

We demonstrate the first Kerr lens mode-locked Yb:CaGdAlO4 (Yb:CALGO) thin-disk laser oscillator. It generates pulses with a duration of 30 fs at a central wavelength of 1048 nm and a repetition rate of 124 MHz. The laser emits the shortest pulses generated by a thin-disk laser oscillator, equal to the shortest pulse duration obtained by Yb-doped bulk oscillators. The average output...

Université de Neuchâtel

Ramsey spectroscopy in a Rubidium vapor cell and realization of an ultra-stable atomic clock

Gharavipour, Mohammadreza ; Mileti, Gaetano (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Divers domaines d’application dans l’industrie, les télécommunications, la navigation et l’espace exigent des étalons de fréquence fiables, compacts et performants avec un niveau de stabilité de −14 à 105s (équivalent à <1 ns/jour). Avec la technologie des lasers à semi-conducteurs, la technique du pompage optique par laser a ouvert de nouveaux...

Accès public à partir du 1 mars 2019
Université de Neuchâtel

First uncertainty evaluation of the FoCS-2 primary frequency standard

Jallageas, Antoine ; Devenoges, Laurent ; Petersen, M ; Morel, J ; Bernier, L. G ; Schenker, Dominique ; Thomann, Pierre ; Südmeyer, Thomas

In: Metrologia, 2018, vol. 55, no. 3, p. 366-385

We report the uncertainty evaluation of the Swiss continuous primary frequency standard FoCS-2 (Fontaine Continue Suisse). Unlike other primary frequency standards which are working with clouds of cold atoms, this fountain uses a continuous beam of cold caesium atoms bringing a series of metrological advantages and specific techniques for the evaluation of the uncertainty budget. Recent...

Université de Fribourg

Local real-space view of the achiral $1T\text{\ensuremath{-}}{\mathrm{TiSe}}_{2}$ $2\times2\times2$ charge density wave

Hildebrand, Baptiste ; Jaouen, Thomas ; Mottas, Marie-Laure ; Monney, Gaël ; Barreteau, C. ; Giannini, E. ; Bowler, D. R. ; Aebi, Philipp

In: Physical Review Letters, 2018, vol. 120, no. 13, p. 136404

The transition metal dichalcogenide 1T−TiSe2-two-dimensional layered material undergoing a commensurate 2×2×2 charge density wave (CDW) transition with a weak periodic lattice distortion (PLD) below ≈200 K. Scanning tunneling microscopy (STM) combined with intentionally introduced interstitial Ti atoms allows us to go beyond the usual spatial resolution of STM and to intimately probe...

Consortium of Swiss Academic Libraries

Conformation-Specific Spectroscopy of Peptide Fragment Ions in a Low-Temperature Ion Trap

Wassermann, Tobias ; Boyarkin, Oleg ; Paizs, Béla ; Rizzo, Thomas

In: Journal of The American Society for Mass Spectrometry, 2012, vol. 23, no. 6, p. 1029-1045

Consortium of Swiss Academic Libraries

Short Timescale Core Dynamics: TheoryandObservations

Finlay, C. ; Dumberry, M. ; Chulliat, A. ; Pais, M.

In: Space Science Reviews, 2010, vol. 155, no. 1-4, p. 177-218